Phosphorus Facts - Element Characteristics Properties

Phosphorus Facts - Element Characteristics Properties Phosphorus is a reactive nonmetal with element symbol P and atomic number 15. It is one of the essential elements in the human body and is widely encountered in products such as fertilizers, pesticides, and detergents. Learn more about this important element. Phosphorus  Basic Facts Atomic Number: 15 Symbol: P Atomic Weight: 30.973762 Discovery: Hennig Brand, 1669 (Germany) Electron Configuration: [Ne] 3s2 3p3 Word Origin: Greek: phosphoros: light-bearing, also, the ancient name given the planet Venus before sunrise. Properties: The melting point of phosphorus (white) is 44.1 °C, boiling point (white) is 280 °C, specific gravity (white) is 1.82, (red) 2.20, (black) 2.25-2.69, with a valence of 3 or 5. There are four allotropic forms of phosphorus: two forms of white (or yellow), red, and black (or violet). White phosphorus exhibits a and b modifications, with a transition temperature between the two forms at -3.8 °C. Ordinary phosphorus is a waxy white solid. It is colorless and transparent in its pure form. Phosphorus is insoluble in water, but soluble in carbon disulfide. Phosphorus burns spontaneously in air to its pentoxide. It is highly poisonous, with a lethal dose of ~50 mg. White phosphorus should be stored under water and handled with forceps. It causes severe burns when in contact with skin. White phosphorus is converted to red phosphorus when exposed to sunlight or heated in its own vapor to 250 °C. Unlike white phosphorus, red phosphorus does not glow or burn in air, although it still requires careful handling. Uses: Red phosphorus, which is relatively stable, is used to make safety matches, tracer bullets, incendiary devices, pesticides, pyrotechnic devices, and many other products. There is a high demand for phosphates for use as fertilizers. Phosphates are also used to make certain glasses (e.g., for sodium lamps). Trisodium phosphate is used as a cleaner, water softener, and scale/corrosion inhibitor. Bone ash (calcium phosphate) is used to make chinaware and to make monocalcium phosphate for baking powder. Phosphorus is used to make steels and phosphor bronze and is added to other alloys. There are many uses for organic phosphorus compounds. Biological Activity: Phosphorus is an essential element in plant and animal cytoplasm. In humans, it is essential for proper skeletal and nervous system formation and function. Phosphate deficiency is called hypophosphatemia. It is characterized by low soluble phosphate levels in serum. Symptoms include disruption of muscle and blood function due to insufficient ATP. An excess of phosphorus, in contrast, leads to organ and soft tissue calcification. One symptom is diarrhea. The estimated average requirement for dietary phosphorus for adults age 19 and older is 580 mg/day. Good dietary sources of phosphorus include meat, milk, and soy beans. Element Classification: Non-Metal Phosphorus Physical Data Isotopes: Phosphorus has 22 known isotopes. P-31 is the only stable isotope. Density (g/cc): 1.82 (white phosphorus) Melting Point (K): 317.3 Boiling Point (K): 553 Appearance: white phosphorus is a waxy, phosphorescent solid Atomic Radius (pm): 128 Atomic Volume (cc/mol): 17.0 Covalent Radius (pm): 106 Ionic Radius: 35 (5e) 212 (-3e) Specific Heat (20 °C J/g mol): 0.757 Fusion Heat (kJ/mol): 2.51 Evaporation Heat (kJ/mol): 49.8 Pauling Negativity Number: 2.19 First Ionizing Energy (kJ/mol): 1011.2 Oxidation States: 5, 3, -3 Lattice Structure: Cubic Lattice Constant (Ã…): 7.170 CAS Registry Number: 7723-14-0 The glow of phosphorus in air is chemiluminescence and not phosphorescence. cloverphoto / Getty Images Phosphorus Trivia: Hennig Brand isolated phosphorus from urine. He kept his process a secret, choosing instead to sell the process to other alchemists. His process became more widely known when it was sold to the French Academy of Sciences.Brands technique was replaced by Carl Wilhelm Scheeles method of extracting phosphorus from bones.The oxidation of white phosphorus in air produces a green glow. Although the term phosphorescence refers to the elements glow, the true process is oxidation. The glow of phosphorus is a form of chemiluminescence.Phosphorus is the sixth most common element in the human body.Phosphorus is the seventh most common element in the Earths crust.Phosphorus is the eighteenth most common element in seawater.An early form of matches used white phosphorus in the match head. This practice gave rise to a painful and debilitating deformation of the jawbone known as phossy jaw to workers when over-exposed to white phosphorus. Sources Egon Wiberg; Nils Wiberg; Arnold Frederick Holleman (2001). Inorganic chemistry. Academic Press. pp. 683–684, 689. ISBN 978-0-12-352651-9.Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd Ed.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.Hammond, C. R. (2000). The Elements. in Handbook of Chemistry and Physics (81st ed.). CRC press. ISBN 0-8493-0481-4.Vanzee, Richard J.; Khan, Ahsan U. (1976). The phosphorescence of phosphorus. The Journal of Physical Chemistry. 80 (20): 2240. doi:10.1021/j100561a021Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

Common Sense 1776 by Thomas Paine Essay Example | Topics and Well Written Essays - 1250 words

Common Sense 1776 by Thomas Paine - Essay Example According to the story, Henry cannot afford any investment since he is a pauper and has no experience in business matters. However, things took a different turn when he met and fell in love with Portia. Investment’s intelligence dawn on him because of his quest to retain his love and secure their future; this help him invest the million pounder bill wisely. Twain’s short story to keep one’s capital flowing could be compared to keeping aspiration and ambition alive till one achieve the objective. Henry as an individual could have not made the investment succeed if the quest to continue loving and staying with Portia was absent. Keeping one’s capital moving simply implies striving to secure what one really desire no matter the odds. The story conceives capital as sources of inspiration that enable one succeed if properly harnessed and used purposefully. The capital for Henry was his quest and worries about keeping his love though a million was there if this quest was absent then investment could have collapse or better still not started. 3. Answer According to Thorstein Veblen, â€Å"pecuniary emulation†Ã‚  Ã‚   means the behavior in which people try to emulate other people who are socially well off. Pecuniary emulation is simply the state where one strives to equal or surpass the other in terms of wealth. He observes that as people increasingly acquire wealth, their social class and lifestyles changes. The hierarchy of needs progresses as one satisfies one level and the last one is to achieve luxury more than anybody else. As these aspects of their lives change, they are seen by others to live decently and comfortably. They act as role models as those who envy them try to emulate their behavior and lifestyles. As a result, they try to improve on their earnings and acquire things that closely resemble those of the high people in the society.   The best mode of display this is through luxurious lifestyle since basic provision a nd standard living is hard to measure. Veblen acknowledges that luxurious lifestyle is the best mode of surpassing those ahead and greatly enlarging the gap between those below. 4. B. Answer The repeated saying from â€Å"The Way to Wealth† that ’Tis easier to suppress the first Desire, than to satisfy all that follow it† means that it is easy to avoid the first desire to take a debt and either invest it or spend. Theoretically it is very easy to resist desire; however, practical life endeavors negate the theoretical assumptions. The old man keeps repeating the advice since he knows people take it lightly due to theoretical assumptions. However, after the first desire has overcome an individual and falls into the trap, it is impossible to from seeking debt. It all begins with the first debt and others follow, creating a chain of other debts that are insatiable. The repetition suggests the author’s desire to make this advice known to people by insisting on it. Repetition of the old man is a form of emphasis so that the advice is taken seriously and

Major Health and lifestyle Issues Essay Example | Topics and Well Written Essays - 2500 words

Major Health and lifestyle Issues - Essay Example The connection is that the kind of lifestyle that a person exhibits predisposes him or her to a health issue. These issues include the cancers, obesity and cardiac conditions. They are closely related to lifestyles and behaviours such as smoking, diet and nutritional changes and overweight, and alcohol and drugs abuse. This paper will deal with some of these health and lifestyle issues in depth. Cancer is a serious and potentially fatal condition that affects the body cells. The disease is as a result of a combination of hereditary and environmental factors that result to gene mutation (Gray 2005). When cell growth regulatory genes are mutated, they fail to regulate cell growth resulting in an aberrant cell behaviour, uncontrolled expansion of cell masses that destroy the cell surrounding by causing excess pressure on organs and tissues. This affects the functions of the organs. In extensive case, the aberrant cells are disseminated in other parts of the body causing the spread of the cancer, a phenomenon called metastasis (UK 2014). When the cancer metastasis to vital organs, it spreads faster, and the prognosis becomes poor. The environmental factors that result to cancer includes exposure to carcinogens, which are present in some foods, water and air. Tobacco and diet have been found to be the causes of up to 30% of new cancer cases in the world. This means that much o f the cancer is preventable. According to WHO, cancer is among the leading causes of mortality in the world. In 2012, the disease caused an approximate of 8.2 million deaths. There are many kinds of cancers, named according to the affected organ (Naidoo &Wills 2010). Lung, liver, gastric, colorectal, and breast cancers are the most common and the main causes of the cancer-related deaths in that order (DeVita, Hellman, & Rosenberg 2005, p.  26). It is estimated that one-thirds of the cancer deaths are related to behavioural and lifestyle changes

Analysis Of Celcom Axiata Investment In Tune Talk Marketing Essay

Analysis Of Celcom Axiata Investment In Tune Talk Marketing Essay Celcom Axiata is a member of Axiata Group is facing tough competition against the other major telecommunication rivals. Having coined as malay telco provider that is, Celcom Axiata has weak penetration into some major markets and the strategy to overcome this is by appointing the Mobile Virtual Network Operators (MVNO) to penetrate into the identified markets using their own brand, look and feel. Celcom Axiata business model for Tune Talk MVNO is by having 35% stakes in the company. After over 11 months in operation, Celcom Axiata is reviewing its position in this company whether to remain its stake, increase its shareholding or pullout. Prior to making any decision with its investment, Celcom Axiata needs to evaluate the existing Tune Talk financial standing and its capability to provide the required return on investment as well as its ability to handle the issues at hands especially those concerning the cash flows. Introduction Celcom Axiata is one of the 4 major mobile telecommunication companies in Malaysia. As at 31st March 2010, Celcom Axiata was ranked as second largest mobile telecommunication company behind Maxis, and ahead of Digi and U Mobile respectively. Celcom Axiata is a member of Axiata Group of companies who manage a group of Mobile Telecommunications in the Asia region. Axiata Group was previously known as TM International and part of TM (Telekom Malaysia) Group. The process of de-merger within TM Group saw the birth of Axiata Group, meant to focus on mobile telecommunications arm of the corporation within the region whilst TM continue to maintain its fixed lines business as well as broadband provider. According to the first quarter financial report, Celcom Axiata continue to show double digit growth on a YoY basis in all key indicators. Revenue was up 15% whilst Earning Before Interest Tax Depreciation and Amortization (EBITDA) increased by 16%. In tandem, Profit After Tax (PAT) was up 24% in the same period. On a QoQ basis, Celcom continued to show positive performance. Despite coming off an exceptional 4Q09, which recorded the highest ever quarterly growth, revenue growth was marginal, but still up by 0.2%. Continued focus on costs saw EBITDA up by 2% with margins improving by 0.7 percentage points QoQ to 45.4%. PAT showed a robust increase of 7% to RM441 million (Celcom Axiata media release, 27th May 2010). Celcom Axiata has been aggressively expanding its network and coverage to cater for the increasing demand by the customers. Despite its continuous efforts to penetrate into the various segments in this country, Celcom Axiata still lagging in some of key markets such as the Chinese market segment, immigrant market segment and student market or low income earners segment. These markets are predominantly controlled by Maxis and Digi and will be the key success factor for Celcom Axiata to capture in order to become the number one mobile telecommunication provider in this country. One of the strategy to penetrate into these segments as single out by Celcom Axiata is by way of having a Mobile Virtual Network Operator (MVNO) approach. MVNO means Celcom Axiata will appoint a third party to run the mobile business using their own brand, leveraging on their own strength such as networking, channel of distribution, marketing and customer service. By doing this, Celcom Axiata can reduce its financial burden on the go-to-market cost which in turn will be born by the MVNO partners themselves. To date there are four MVNOs appointed and launched by Celcom whereby each of them is given different market segment to penetrate and capture. Each MVNO is treated as separate entity from Celcom Axiata where the respective MVNOs have full control over their own operations and management of the companies except for Tune Talk Sdn Bhd where Celcom Axiata has 35% share of the company. Being different business model from other MVNOs, Tune Talk Sdn Bhd is seen as another Celcom Axiata joint venture company. Tune Talk is owned by the following shareholders as shown in figure 1 below : Tune Ventures (owned by Datuk Seri Tony Fernandes and Datuk Kamarudin Meranun) Individuals shareholders are Datuk Seri Kalimullah Masheerul Hassan, Lim Kian Onn, Jason Lo (the CEO of Tune Talk), Gurtaj Singh (the COO of Tune Talk) and Mark Lankaster (the CEO of Tune Hotels) Celcom decision to have its stake in Tune Talk is to ensure it has some form of control as one the major shareholder. Although Tune Talk management will have the control over the management of the company but the shareholders will have their voice heard during the monthly board exco meeting. Having represented by 2 permanent exco members from Celcom, it can ensure that Tune Talk business plan and strategies are in line with its goal to become one of the top mobile service provider in this country. The Situation Tune Talk is approaching its first anniversary on the coming 19th August 2010. Celcom need to assess its investment and evaluate whether Tune Talk business is moving to the right direction and hence generate the desired dividends to shareholders. In order to achieve the target, Celcom needs to keep track of Tune Talk managements way of running the business. The permanent exco members sitting in the boardroom must be able to drill down to the bottom line and analyze their way of spending their fund. This is very important to Celcom as the major shareholder in Tune Talk so it can decide on the next course of actions such as to inject more fund into Tune Talk, or to remain its position without adding anymore cash or worst case decide to pull out from the pack. Prior to such decision, Celcom needs to gather as much information as possible with regards to Tune Talk financial position, business directions, marketing strategies and other commercial matters which will be the key determination factors. Based from the previous exco meeting it was learned that Tune Talk is facing difficulties to move forward with its business plans and marketing strategies due to shortage of cash flow. Tune Talk Chief Financial Officer (CFO) during his presentation to the board of directors highlighted the following scenarios : a. Increase in Managed Services Costs Tune Talk adopted the managed services concept to deploy and maintain the Intelligent Network (IN) billing system, network related infrastructure namely Short Message Services Centre (SMSC), Home Location Register (HLR) and other Value Added Services (VAS). Managed services concept is a new trend in telecommunication and information technology (IT) business whereby the customers or business operators do not buy outright the related systems but pay to the supplier or provider on usage based. This method saves the company from spending an upfront purchase of an asset, hence reduce the cash outflow. Managed services can help a particular company to avoid from having to allocate depreciation cost which may impact the company balance sheet. In the case of Tune Talk the burden they are facing now is due to the increase in the amount to be spent on this managed services. The deal they are having right now is based on the number of subscribers using the system, the higher the number of subscribers the higher the managed services cost to be incurred. The amount will grow in tandem with the intake of new subscribers where the average cost per subscriber remain unchanged. Unlike buying own fixed asset, the average cost will tend to reduce as the number of new subscribers grow until it reaches the economic of scales. Increase in Channel and Distribution Cost In Malaysia, all the mobile operators are highly dependant to the normal traditional channel ie. mobilephone dealers to sell its SIM card and recharge vouchers. Being too dependant to this type of distribution channel will increase the companys cost of sales whereby for every sales of SIM cards or recharge voucher the company needs to allocate some amount of percentage as an incentive for them to push its products over the competitors. Traditionally, in mobile telecommunication business the channel of distribution consist of 3 layers : distributors master dealers ordinary dealers Normally only a handful of distributors are being appointed to distribute to the master dealers whom will then sell it through the ordinary dealers. Each of these channels will keep a small percentage as their incentive from the retail price. Operators are normally stuck with this channel cost which they cannot run away with in order to push their products to the customers. On average an operator will have to spend not less than 10% from its retail price being part of the channel cost. Allocation for Marketing Cost As a new mobile operator in Malaysia competing against the other 4 major mobile telecommunications service providers Tune Talk is facing a tough time to introduce its brand to the market. According to Nielsen Co Malaysia 2009 report (a research company), the telecommunication companies are among the highest contributor to the total advertising expenditure in Malaysia with Celcom leading the pack at RM 115.8 million, followed by Telekom Malaysia at RM 94.3 million, Maxis with RM 89.7 million and Digi for RM 87.1 million (see Figure 2 below). Newspaper and TV advertisement represent the top 2 categories for advertising followed by Radio, Magazine and Outdoor. To date Tune Talk had already spent RM 2 million in their advertising cost through billboards, newspaper, TV and radio advertisements. This amount is rather very small compare to the amount spent by the big giants and it may not give the required exposure that Tune Talk expected to create its brand awareness to the market place. Based from the report and dip stick survey conducted by Tune Talk marketing department their brand index is still very low and they would require more fund to be pumped in for this purpose. Slow Moving of Customer Recharge Activities Tune Talk is only selling prepaid mobile and it main source of income is by selling the SIM card and recharge vouchers. As far as Tune Talk is concern the revenue generated from these sales are considered as their income (based on the generally Accepted Accounting Principle). This is due to the fact the income will be reported when it is earned (Ross, Westerfiled, Jaffe, Corporate Finance, 7th edition). The good thing about prepaid business is the transactions are in cash terms. This means Tune Talk will get to record the transaction into its book as and when the SIM cards or vouchers are sold to the distributors. In accounting, the revenue from sales of SIM cards and recharge vouchers will only be realized upon usage and not upon sales. Nonetheless, as far as Tune Talk income is concerned it has already acquired the money from the distributor and realized in its book as income as per GAAP. As a rippling effect to lack of awareness of its brand in the market place, Tune Talk sales of SIM cards and recharge vouchers are moving rather at a very slow pace. Table 1 below is example of the average sales and projected 1st year revenue from SIM cards and recharge vouchers : Table 1 Items Average Monthly Revenue Projected 1st Year Revenue SIM Cards RM 500,000 RM 6,000,000 Recharge Vouchers RM 900,000 RM 10,800,000 Total RM 1,400,000 RM 16,800,000 This figure is far cry from the original budget that Tune Talk has to make which is RM 36.0 million for its first year operation and increase to RM 50.0 million and RM 72.0 million in year 2 and 3 respectively. High Customer Turnover or Attrition Rate It is common in the prepaid business industry that users tend to move or hope around from one operator to another operator to find for better offer and cheaper cost. Tune Talk is also affected by this game by the customers whereby the rate of customers churning out or leaving for another brand keep on increasing on month-on-month basis. Malaysian prepaid business industry rate of customers staying in a particular operator (industry language is length of stay) is in average of 6 months. However in the case of Tune Talk its customers average length of stay is a mere 3 months which is about half of the industry average. The impact of this short stay will cause a high acquisition cost to Tune Talk whereby its cash flow will be badly affected. In order to stay healthy, Tune Talk needs more than 3 months for each customer with average usage of RM 30 per month to recover its upfront acquisition cost such as the channel incentive, marketing cost and the other variable costs. Shortage of Cash Tune Talk started off its business with RM 7.5 million worth of shares with 35% own by Celcom whilst the remainder are by several other individuals. After 11 months of operations, Tune Talk is now facing with the most critical moment in its business where their cash flow is deteriorating. Despite being a lean and mean in expenditure and had not spent any money on fixed asset, Tune Talk still face the cash flow difficulty. An area that has badly affected Tune Talk cash flow is the channel incentive and the wholesale airtime rates that it has to pay back to Celcom. With intense competition Tune Talk needs to set its incentive on par or slightly better than the competition in order to get the channel attention and support. On the other hand, the prepaid business market is competing on the call rates to be offered to the end users in order to beat the others. Since Tune Talk is buying its airtime from Celcom at fixed rate, the competition which had forced Tune Talk to also lower down its selling rate to the end users had cause Tune Talk margin to shrink and became smaller. The result is, the income collected from the sales of SIM cards and recharge vouchers will have to be spent largely to incentive and wholesale airtime to Celcom, leaving only peanuts to Tune Talk to be used to re-generate its business. It is also better for Tune Talk to maintain a level of working capital that allows it to make it through those crunch times and continue to operate the business within tight budget (Cater McNamara, Authenticity Consulting LLC). Action Celcom Axiata really need to review its investment in Tune Talk Sdn Bhd by looking at the present situation and its potential. It is a known fact that every new business need some times to be able to stabilize and start to show positive result out of its investment. As far as telecommunication industry is concerned, a minimum of 3 years is required in order for a particular mobile operator to have a strong foothold and have substantial subscriber base to be relevant. The question here is whether Tune Talk strategies are gearing towards the right direction which will guarantee to bear fruits at the end of 3 years? How much will investor need to pump in to ensure that Tune Talk can still survive until the 3rd year ? It is imperative that Celcom Axiata representatives in the Tune Talk board of directors to insist Tune Talk management to review their existing business models which had obviously affected their cash flows. Serious attention must be given by Tune Talk management to revisit its dependency on the existing channel which will become its biggest threat in trying to minimize its cash out flows. Tune Talk management also needs to re-negotiate with its managed services provider to review the charges being imposed to Tune Talk for every new subscribers added into the system. The charges should be on decreasing trend as more customers being added. Tune Talk may also want to consider finding new manage service provider should the negotiation come to a dead end. This is important in managing Tune Talk spending over the long run. Prior to Celcom Axiata to make any decision with its investment, it needs to analyze Tune Talk financial condition. It is advisable for Celcom Axiata to scrutinize the Tune Talk financial management and ensure that all the monies are well spent and efficiently managed to protect its interest. Celcom Axiata finance manager needs to advice the Chief Financial Officer (CFO) of the real condition of Tune Talk by analyzing its financial statement cash flows. Having spent for over RM 2.6 million and holding 35% of Tune Talk shares, Celcom Axiata has the responsibility to report to its board of directors on the progress of its investment. The Celcom Axiata board of directors must be very interested to know whether the management of Celcom Axiata has made the right decision by investing in Tune Talk. One thing interesting in this business model ie MVNO is because the airtime being sold by Tune Talk (in this case the MVNO) is using Celcom network infrastructure. This means even though Tune Talk does not make huge profit and may not be able to provide the required rate of return in terms of dividends to the shareholders but as far as Celcom Axiata is concerned, it still make money from the airtime sold. Thus, board of directors of Celcom Axiata may well be pleased by the increase in Celcom Axiata revenue alone rather than going down to the details of earning through the Tune Talk dividends. Another area that needs special attention is to assess the existing Tune Talk management team style and business competencies. This industry is regarded as highly competitive and it takes excellent team to be able to compete with the big boys (as being referred to the seasoned mobile operators). Celcom Axiata representatives in the Tune Talk exco members must be able to provide information to the Celcom Axiata management whether there is an existence of conflict of interest in the Tune Talk management team. Although according to Vishny and Robert W, NBER Reporter, September 1989 said that the standard and ideally corporation allows management to have 5% of shares. This can be ascertained by judging into their way of running the business, their seriousness in fulfilling the required tasks as outlined in the business plans, their priorities in spending and handling the cash flows. Conclusion It is probably premature for Celcom Axiata to make decision to pull out from this pack by merely basing on the first 11 or 12 months Tune Talk operation. However any decision to increase its capital in Tune Talk either by buying more shares or by pumping more money to support Tune Talk operations must be done with great detail analysis. It is not advisable for Celcom Axiata to simply inject more cash to Tune Talk without seeing any progress or improvement on some of the area of concern which have been highlighted in previous pages. The major issues that need to be really scrutinize by Celcom Axiata financial manager is on the cash flow management. The action items highlighted in previous pages suggested Tune Talk to improve the way it runs its business which will eventually give a positive impact to its cash flow. It is said that high risk will normally generate high rate of return, but having said that, the save decision at the moment is for Celcom Axiata to remain its position without adding more cash but to continue to monitor Tune Talk progress and improvement. After all, Celcom Axiata is the one who makes more money from anyone else in the pack which is through the sales of wholesale airtime. This investment although had not been able to generate dividends to Celcom Axiata but somehow has managed to complement the weak area that cannot be penetrated by Celcom Axiata using its own brand.

The Supernatural in Shakespeares Macbeth :: GCSE English Literature Coursework

The Supernatural in Macbeth   Ã‚        Everyone has a slightly different interpretation of the supernatural but the interpretation which we can start with is Shakespeare’s. Everyone of Shakespeare’s time found the supernatural fascinating. Shakespeare interpreted the supernatural as witches, magic, unnatural and evil and he expressed his beliefs in the play, â€Å"Macbeth† very clearly, as he portrayed the three deformed women with control over the weather and the ability to predict the future. These three evil witches with magical powers were the creation of Shakespeare’s interpretation of the supernatural. Shakespeare’s contemporaries believed in the supernatural very strongly and a majority of them were frightened of it, including the king of that time, King James I of England.   Ã‚   Since it was an interesting issue which many people of Shakespeare’s time felt they were affected by, Shakespeare wrote about it. â€Å"Macbeth† with its supernatural theme was the 17th century’s equivalent to the modern day horror movie.   Ã‚   The play begins with a supernatural scene, where the three witches meet and give many clues as to who they are or what they have control over,   Ã‚   â€Å"†¦we three meet again in thunder, lighting or in rain?†¦.When the battle’s lost and won†¦.That will be ere the set of sun†¦.There to meet with Macbeth.†   Ã‚   This scene sets the atmosphere for the rest of the play. If this scene was not there it would be difficult for the audience to understand how later scenes are linked or how these three women can tell Macbeth’s future. Also if elements of the supernatural were not used in Act 1 Scene 1, as they have been, the witches could not be shown as sinister and evil. These two elements of horror, â€Å"sinister† and â€Å"evil† would later be used to explain the cause of the three witches’ behaviour further on in the play.   Ã‚  Ã‚   As the play continues the supernatural is used more. Act 1 Scene 3 is Macbeth’s first meeting with the witches, and is also the first time the audience sees or experiences the witches’ supernatural abilities.   Ã‚   â€Å"All hail to thee, Thane of Cowdor, All hail, Macbeth! That shalt be king hereafter†.   Ã‚   The witches predict Macbeth’s future and tell him that he shall become the Thane of Cowdor and then king. The rest of the play is based on this supernatural happening. After learning that Macbeth is to become King of Scotland the play follows Macbeth’s plot to get rid off King Duncan and then Macbeth’s life after the murder.

Young’s Double Slit Experiment

Young’s double slits Formal Lab Florencia Shi Purpose: The double slits experiment was conducted to observe the interference of light waves, to explore how interference pattern would be affected by different colours, and to determine whether interference would change if the angle of slits was changed horizontally or vertically. Hypothesis: Dark and light bands would be seen, and red light causes wider nodal spacing, while blue light causes shorter nodal spacing. Materials: In this experiment, a lamp base assembly, a piece of blue filter, a piece of red filter, a slit plate, a laser pointer, a meter scale, and a 40 W lamp were used.Procedures: 1. A 40 W lamp was assembled in a lamp base assembly, and the assembly was settled on the edge of a desk top. 2. The lamp was turned on. And the filament of the lamp was seen, from a distance, by a person through the double slits on the slit plate. The shape of the interference was recorded. 3. A piece of red filter was placed in front of the lamp, and the lamp was seen, from a distance through the same double slits. The change of the interference pattern was recorded. 4.The filament of the lamp was seen by a student standing a certain distance away through the same double slits with a piece of blue filter placed in front of the lamp. The change of interference pattern was observed. 5. The slit plate was rotated vertically and horizontally, while other factors were kept constant. The change of interference pattern was observed. 6. The laser light conducted by the laser pen was directed through the double slits onto a piece of paper located 3m away. The interference pattern was observed through the slits. 7. The nodal spacing on that piece of paper was measured. 8.Step 6 and step 7 were repeated at a distance of 2m away. Observations: 1. The patterns of lamp light interference were dark and light bands, while the patterns of laser interference were dark and light spots. 2. After the red filter was placed in front of the lamp, the nodal spacing increased. After the blue filter was placed in front of the lamp, the nodal spacing decreased. 3. After the slit plate was rotated vertically, the light and dark bands were not parallel to each other any more, because after the slit plate was rotated vertically, the top and bottom of the double slits were not in the same vertical straight line.After the slit plate was rotated horizontally, the nodal spacing increased, because the distance between two slits (d) decreased. |Distance |? x1/2 |? x2 |? x3 |? x4 |? x5/2 |? xav | |(m) | | | | | | | |3m |0. 0022 |0. 0051 |0. 0049 |0. 0042 |0. 0025 |0. 0047 | |2m |0. 020 |0. 0048 |0. 0042 |0. 0039 |0. 0021 |0. 0043 | Discussion: 1. Dark and light bands were seen through the double slits. These were seen because the two lights came from the same source and had the same frequency. Therefore interference of light waves occurred. The light band was where two crests or two troughs intersected (antinodes), and the dark band was where a crest and a trough intersected (nodes). 2. A wider nodal space occurred in the interference pattern.Since when the lamp was blocked by the red filter, only red light could go through it, and the dark band occurs when the difference between the travelling distances of the two light waves is half of the wavelength. Since the red light has a longer wavelength, half of the wavelength increases accordingly, which means the dark bands will be more away from the central bright band. 3. The nodal space of the interference pattern decreased, since blue light has a shorter wavelength. 4. Blue has the shorter wavelength, and it was proved when the nodal spacing of the interference pattern became shorter. 5.After the slit plate was rotated vertically, the light and dark bands were not parallel to each other any more, because after the slit plate was rotated vertically, the top and bottom of the double slits were not in the same vertical straight line. After the slit plate was r otated horizontally, the nodal spacing increased, because the distance between two slits (d) decreased. 7. The pattern of laser interference consisted of light and dark spots, while the pattern of lamp light interference consisted of dark and light bands, because the light of the lamp could diffuse into a wider range of direction, while laser was ollimated, and was directed into a much narrower direction. 8. |Distance |? x1/2 |? x2 |? x3 |? x4 |? x5/2 |? xav | |(m) | | | | | | | |3m |0. 0022 |0. 0051 |0. 0049 |0. 0042 |0. 0025 |0. 0047 | |2m |0. 0020 |0. 0048 |0. 0042 |0. 0039 |0. 0021 |0. 0043 | 9. 1. Conclusion: Based on observations gathered during the experiment, the interference pattern of the 40 W lamp consisted of dark and light bands. When red filter was used, the nodal spacing of the pattern increased, and when blue filter was used, the nodal spacing of the pattern decreased. After the slit plate was rotated vertically, the light and dark bands were not parallel to each oth er any more. After the slit plate was rotated horizontally, the nodal spacing increased. The interference pattern changed into dark and light spots, after laser pointer replaced the lamp as a light source.The wavelength of the laser was predicted to be And the percentage of error calculated was Experimental Uncertainties: 1. The value of nodal spacing (? x) measured was not precise because the scale of a meter scale is only accurate to millimetres. 2. The slit plate was not exactly parallel to the screen that interference pattern was shown. 3. The measured nodal spacing (? x) was not precise due to the width of the slit. The d was only the distance between two slits, without including the width of the slit.

Developmental Theories That Assist Social Workers Essay

Developmental theories are integral to a social workers approach when working with children, and families as they help to guide and explain situations and behaviours. As social workers have an ethical and professional responsibility to their clients, they need to have an established set of guiding theories which underpin their practice. If they work without these theories, they could place their clients at risk of harm by practising from personal assumptions. They also help the social worker understand and manage these situations and to reach the desired outcomes. As suggested by Teater (2014), â€Å"Theory is an essential ingredient in practice that guides the way in which social workers view and approach individuals, groups, communities and society†(Chap 1, p.1). This report will identify and focus on three important developmental theories that assist social workers in their practice. These consist of work by Erikson, Bowlby and Piaget. 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