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Photoelectric Effect: Problem 4 Previous Problem Problem List Next Problem Results for this submission Answer Prevlew 6.646 correct 6.646 0.49999 0.49999 2537.93 2537.93 At least one of the answe...
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light...
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light from a 3 mW laser. How many photons per second are emitted by the laser? 4.0909E15 photons/s Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.00031%. What is the current in the detector assuming all the emitted electrons are captured? пA Note that current is charge(in Coulombs) per second. The charge of one...
6. Photoelectric effect. You perform a photoelectric experiment on an unknown material and get the following...
6. Photoelectric effect. You perform a photoelectric experiment on an unknown material and get the following data: Stopping potential (V) 0.4 Frequency (THz) 560 700 780 830 1010 1210 1.3 1.7 2.4 From this data, and using Excel or an equivalent data tool, find a. the work function (in eV). b. the cutoff (threshold) wavelength for this material, c. the slope, d, an estimate of h e. What is your percent error in your h calculation? Include the Excel graph...
Polynomial Review: Problem 18 Problem List Next Problem Previous Problem Results for this submission Message Result...
Polynomial Review: Problem 18 Problem List Next Problem Previous Problem Results for this submission Message Result Answer Preview Entered This answer is equivalent to the one you just submitted (-17/500000)(x- incorrect The answer above is NOT correct (1 point) Find an equation with real coefficients for the polynomial that passes through the point (0,68) that has the following roots with the given multiplicities. Root -422+3+ 214 2 f(17/(500000) (x-2x+4)*2 (x
Previous Problem Problem List Next Problem Results for this submission Answer Preview Result Ente...
Previous Problem Problem List Next Problem Results for this submission Answer Preview Result Entered 467 280 correct 1.66786 1.37275 incorrect 1.37275 At least one of the answers above is NOT correct. (1 point) Use Newton's method to find the second and third approximation of a root of 2x +7x +4 0 starting with x 2 as the initial approximation. The second approximation is x2467/280 The third approximation is x31.37275 Note: You can earn partial credit on this problem.
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Question (2) Choose the correct answer. Justify your answer In a photoelectric experiment, the stopping potential...
Question (2) Choose the correct answer. Justify your answer In a photoelectric experiment, the stopping potential is 1 V, the work function is 2 eV. The intensity of the incident light is doubled and the frequency reduces to half its initial value. Answer the following two questions 1) In this new situation, the work function of the cathode is: a) 4 eV b) 2 eV l eV d) 6 eV e) 3 eV In this new situation, the saturation current:...
Homework 9: Problem 5 Previous Problem Problem List Next Problem Results for this submission Entered Answer...
Homework 9: Problem 5 Previous Problem Problem List Next Problem Results for this submission Entered Answer Preview Result 0.5 0.5 correct 0.25 0.25 correct 10.25, 0.75] [0.25, 0.75] incorrect At least one of the answers above is NOT correct. (1 point) Consider the power series F (-1)"(4x – 2) +3 Find the center and radius of convergence R. If it is infinite, type "infinity or "inf'. Center a = 0.5 Radius R = 0.25 What is the interval of convergence?...
Previous Problem Probler List Next Problem Results for this submission Answer Preview Result 5 correct 0.321...
Previous Problem Probler List Next Problem Results for this submission Answer Preview Result 5 correct 0.321 incorrect 0.322 incorrect At least one of the answers above is NOT correct. (15 points) Thet statistic for a test of H: = 56 HAM#56 based on n-6 observations has the value t = -1.1. (a) What are the degrees of freedom for this statistic? 5 (b) Using the appropriate table in your formula packet, bound the p-value as closely as possible: 0.321 <p-value...
Previous Problem List Next Results for this submission Answer Preview 0.0394 The answer above is NOT...
Previous Problem List Next Results for this submission Answer Preview 0.0394 The answer above is NOT correct. (1 point) A simply supported basswood beam shown below Click on the image to enlarge s 100 inches long and carlies a load of 475 pounds. it has an I cross-section as shown Click on the image to enlarge has the folowing material properties: Modulus of Elestioty-10x100 psi and Density where b- 3 inches, h 3 inches, and t 0.5 inches Basswood 1e5...
Previous Problem List Next Results for this submission Entered Answer Preview Result 375504.8234 375504.8234 -4069.019 -4069.019...
Previous Problem List Next Results for this submission Entered Answer Preview Result 375504.8234 375504.8234 -4069.019 -4069.019 ncorrect At least one of the answers above is NOT correct. (1 point) An investment portfolio changes value at the rate V') 103 whre V is in thousands of doilars and t is the number of years after 2004. By how much does the value of the portfolio change between the years: a. 2004 and 2008? ANSWER:375504.8234 b. 2008 and 2010? ANSWER:-4069.019 Note: You...
Week 1: Problem 11 Previous ProblemProblem List Next Problem Results for this submission Result Entered Answer Preview 4900 J 4900 J incorrect The answer above is NOT correct. (1 point) A bucket...
Week 1: Problem 11 Previous ProblemProblem List Next Problem Results for this submission Result Entered Answer Preview 4900 J 4900 J incorrect The answer above is NOT correct. (1 point) A bucket of water of mass 15 kg is pulled at constant velocity up to a platform 40 meters above the ground. This takes 12 minutes, during which time 6 kg of water drips out at a steady rate through a hole in the bottom. Find the work needed to...
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light from a 3 mW laser. How many photons per second are emitted by the laser? 4.0909E15 photons/s Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.00031%. What is the current in the detector assuming all the emitted electrons are captured? пA Note that current is charge(in Coulombs) per second. The charge of one...
6. Photoelectric effect. You perform a photoelectric experiment on an unknown material and get the following data: Stopping potential (V) 0.4 Frequency (THz) 560 700 780 830 1010 1210 1.3 1.7 2.4 From this data, and using Excel or an equivalent data tool, find a. the work function (in eV). b. the cutoff (threshold) wavelength for this material, c. the slope, d, an estimate of h e. What is your percent error in your h calculation? Include the Excel graph...
Polynomial Review: Problem 18 Problem List Next Problem Previous Problem Results for this submission Message Result Answer Preview Entered This answer is equivalent to the one you just submitted (-17/500000)(x- incorrect The answer above is NOT correct (1 point) Find an equation with real coefficients for the polynomial that passes through the point (0,68) that has the following roots with the given multiplicities. Root -422+3+ 214 2 f(17/(500000) (x-2x+4)*2 (x
Previous Problem Problem List Next Problem Results for this submission Answer Preview Result Entered 467 280 correct 1.66786 1.37275 incorrect 1.37275 At least one of the answers above is NOT correct. (1 point) Use Newton's method to find the second and third approximation of a root of 2x +7x +4 0 starting with x 2 as the initial approximation. The second approximation is x2467/280 The third approximation is x31.37275 Note: You can earn partial credit on this problem.
Previous Problem...
Question (2) Choose the correct answer. Justify your answer In a photoelectric experiment, the stopping potential is 1 V, the work function is 2 eV. The intensity of the incident light is doubled and the frequency reduces to half its initial value. Answer the following two questions 1) In this new situation, the work function of the cathode is: a) 4 eV b) 2 eV l eV d) 6 eV e) 3 eV In this new situation, the saturation current:...
Homework 9: Problem 5 Previous Problem Problem List Next Problem Results for this submission Entered Answer Preview Result 0.5 0.5 correct 0.25 0.25 correct 10.25, 0.75] [0.25, 0.75] incorrect At least one of the answers above is NOT correct. (1 point) Consider the power series F (-1)"(4x – 2) +3 Find the center and radius of convergence R. If it is infinite, type "infinity or "inf'. Center a = 0.5 Radius R = 0.25 What is the interval of convergence?...
Previous Problem Probler List Next Problem Results for this submission Answer Preview Result 5 correct 0.321 incorrect 0.322 incorrect At least one of the answers above is NOT correct. (15 points) Thet statistic for a test of H: = 56 HAM#56 based on n-6 observations has the value t = -1.1. (a) What are the degrees of freedom for this statistic? 5 (b) Using the appropriate table in your formula packet, bound the p-value as closely as possible: 0.321 <p-value...
Previous Problem List Next Results for this submission Answer Preview 0.0394 The answer above is NOT correct. (1 point) A simply supported basswood beam shown below Click on the image to enlarge s 100 inches long and carlies a load of 475 pounds. it has an I cross-section as shown Click on the image to enlarge has the folowing material properties: Modulus of Elestioty-10x100 psi and Density where b- 3 inches, h 3 inches, and t 0.5 inches Basswood 1e5...
Previous Problem List Next Results for this submission Entered Answer Preview Result 375504.8234 375504.8234 -4069.019 -4069.019 ncorrect At least one of the answers above is NOT correct. (1 point) An investment portfolio changes value at the rate V') 103 whre V is in thousands of doilars and t is the number of years after 2004. By how much does the value of the portfolio change between the years: a. 2004 and 2008? ANSWER:375504.8234 b. 2008 and 2010? ANSWER:-4069.019 Note: You...
Week 1: Problem 11 Previous ProblemProblem List Next Problem Results for this submission Result Entered Answer Preview 4900 J 4900 J incorrect The answer above is NOT correct. (1 point) A bucket of water of mass 15 kg is pulled at constant velocity up to a platform 40 meters above the ground. This takes 12 minutes, during which time 6 kg of water drips out at a steady rate through a hole in the bottom. Find the work needed to...
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