Homework Answers
i.
Photosphere - Most of the Sun's visible light that we see from
this region. These have a thickness of 300 km. Temeperature ranges
between 4000 - 6500 K
Chromosphere - Visible only during an eclipse. These have a
thickness of 2000 km. Temeperature ranges between 4000 - 8000
K
ii.
Core temperature of sun : 
Photosphere temperature of sun : 
Ratio --> 
Ratio is 2600 : 1
iii.
The process is Nuclear Fusion where 2 hydrogen isotopes ( deuterium ) combine to form Helium
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a. This part of the question is about the Sun. i. List three differences between properties...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core,...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 100 times that of the Sun, but a surface temperature 0.4 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value Property 4.506 gcm-3 Density 47.9 g mol-I M Molar mass 8,6 x 10- K- 25.6 21.9 Coefficient of thermal expansion Molar heat capacity Thermal conductivity J mol- K- Wm- K- C k A titanium disc, which has a radius of exactly 10cm and thickness of exactly 5 mm at -20 °C, has a hole of radius exactly 1 cm drilled out of its centre....
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of...
Part B: Answer all the questions (15 marks each) Question 1: (15 marks) KB Machine Limited...
Part B: Answer all the questions (15 marks each) Question 1: (15 marks) KB Machine Limited is considering investing $3 million in new machinery, Model X. If the new model is acceptable, the old machine will be disposed at $500,000 immediately. A feasibility study, completed by consultants at a cost of $300,000, has confirmed that the equipment will help increase output and improve quality. The expected sales so generated amount to $1 million per year over the life of the...
hi i need answer from part d Question 2 (48 marks) Consider a firm which produces a good, y, using two factors of...
hi i need answer from part d
Question 2 (48 marks) Consider a firm which produces a good, y, using two factors of production, xi and x2 The firm's production function is Note that (4) is a special case of the production function in Question 1, in which α-1/2 and β-14. Consequently, any properties that the production function in Q1 has been shown to possess, must also be possessed by the production function defined in (4). The firm faces exogenously...
Hello, I need help solving the 3 parts of this question. Part - Factors affecting the...
Hello, I need help solving the 3 parts of this question.
Part - Factors affecting the dissolution process The rate at which a solute dissolves in a solvent depends on the kinetic energy of the soluton, theme of contact and the surface area of contact between the solute and the solvent particles. Both endothermic and exothermic dissolution processes will respond similarly to each factor, however the charge may be more pronounced depending on the thermodynamic penters of the reaction. As...
3. i). Write the formula of four strong acids and four strong bases. ii). List four...
3. i). Write the formula of four strong acids and four strong bases. ii). List four factors that affect the strength of an acid. iii). Predict the relative strength of the following compounds: H2O, H2S and H2Se. iv). Which of the following is the stronger acids: CHCICOOH or CHCI-COOH? Explain. v). Al 3* is not a Bronsted acid, Al(H2O)" is. Explain. vi). All Bronsted acids are Lewis acids, but the reverse is not true. Give two examples of two Lewis...
Taking pure silicon (Si) as an example, explain what is meant by the terms electron-hole generation...
Taking pure silicon (Si) as an example, explain what is meant by the terms electron-hole generation and recombination, how they affect the electrical conductivity, and define what is meant by the "intrinsic carrier density", n. [5 marks] Q3. a) b) With the aid of both lattice and energy band diagrams, explain how n-type doping of Si is achieved and state two types of suitable dopant atoms. [7 marks] c) An n-type region on a Si wafer has a donor concentration...
Part of the question highlighted in Blue. Thanks! 1 If babies are born prematurely, there is...
Part of the question
highlighted in Blue. Thanks!
1 If babies are born prematurely, there is a risk that they wll be under-developed and suffer a variety of health problems. There is good evidence that mothers who give birth prematurely in one pregnancy will also do so in later pregnancies, so in the following studies, the subjects were mothers who had given birth prematurely siniz) an a Cn-1)d in their first pregnancy () Clinicians designed and conducted a study to...
Question 1 ASW, a regional shoe chain, has recently launched an online store. Sales via the...
Question 1 ASW, a regional shoe chain, has recently launched an online store. Sales via the Internet have been sluggish compared to their brick and mortar stores, and management suspects that its regular customers have concerns regarding the security of online transactions. To determine if this is the case, they plan to survey a random sample of their regular customers. Under consideration are several plans for selecting the sample. Name the sampling strategy for each. Plan A - Regular customers...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 100 times that of the Sun, but a surface temperature 0.4 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value Property 4.506 gcm-3 Density 47.9 g mol-I M Molar mass 8,6 x 10- K- 25.6 21.9 Coefficient of thermal expansion Molar heat capacity Thermal conductivity J mol- K- Wm- K- C k A titanium disc, which has a radius of exactly 10cm and thickness of exactly 5 mm at -20 °C, has a hole of radius exactly 1 cm drilled out of its centre....
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of...
Part B: Answer all the questions (15 marks each) Question 1: (15 marks) KB Machine Limited is considering investing $3 million in new machinery, Model X. If the new model is acceptable, the old machine will be disposed at $500,000 immediately. A feasibility study, completed by consultants at a cost of $300,000, has confirmed that the equipment will help increase output and improve quality. The expected sales so generated amount to $1 million per year over the life of the...
hi i need answer from part d
Question 2 (48 marks) Consider a firm which produces a good, y, using two factors of production, xi and x2 The firm's production function is Note that (4) is a special case of the production function in Question 1, in which α-1/2 and β-14. Consequently, any properties that the production function in Q1 has been shown to possess, must also be possessed by the production function defined in (4). The firm faces exogenously...
Hello, I need help solving the 3 parts of this question.
Part - Factors affecting the dissolution process The rate at which a solute dissolves in a solvent depends on the kinetic energy of the soluton, theme of contact and the surface area of contact between the solute and the solvent particles. Both endothermic and exothermic dissolution processes will respond similarly to each factor, however the charge may be more pronounced depending on the thermodynamic penters of the reaction. As...
3. i). Write the formula of four strong acids and four strong bases. ii). List four factors that affect the strength of an acid. iii). Predict the relative strength of the following compounds: H2O, H2S and H2Se. iv). Which of the following is the stronger acids: CHCICOOH or CHCI-COOH? Explain. v). Al 3* is not a Bronsted acid, Al(H2O)" is. Explain. vi). All Bronsted acids are Lewis acids, but the reverse is not true. Give two examples of two Lewis...
Taking pure silicon (Si) as an example, explain what is meant by the terms electron-hole generation and recombination, how they affect the electrical conductivity, and define what is meant by the "intrinsic carrier density", n. [5 marks] Q3. a) b) With the aid of both lattice and energy band diagrams, explain how n-type doping of Si is achieved and state two types of suitable dopant atoms. [7 marks] c) An n-type region on a Si wafer has a donor concentration...
Part of the question
highlighted in Blue. Thanks!
1 If babies are born prematurely, there is a risk that they wll be under-developed and suffer a variety of health problems. There is good evidence that mothers who give birth prematurely in one pregnancy will also do so in later pregnancies, so in the following studies, the subjects were mothers who had given birth prematurely siniz) an a Cn-1)d in their first pregnancy () Clinicians designed and conducted a study to...
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