finalSp06_verAPartASoln

finalSp06_verAPartASoln - Phys 222 Spring 2006 Final, Tue...

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Phys 222 Spring 2006 Final, Tue May 2, 7-9 pm Closed Book, Calculators allowed Part A is the third unit exam, Part B is comprehensive. Do both parts. Each question is worth one point, answer all questions Fill in your Last Name, Middle initial, First Name Your ID is the middle 9 digits on your ISU card. Please fill in your recitation section in special codes K to L For the H1 section please use section 18 At end of exam, please put exam writeup back in the folder, this allows you the chance to appeal the grading Best of luck with you future studies and careers Craig Ogilvie Start at Question 49 on Your Bubble Sheet
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PART A (3 rd UNIT EXAM) 49. What is the maximum photoelectron energy if sodium is illuminated with light of 300 nm (1 nm = 1*10 -9 m) ? Take the workfunction of sodium to be 2.3*10 -19 J. a. 2.3 *10 -19 J b. no photoelectron emission is possible with this light c. 6.6 *10 -19 J d. 5.3 *10 -19 J e. 4.3 *10 -19 J 19 19 9 8 34 max 10 3 . 4 10 3 . 2 10 300 10 3 * 10 63 . 6 × = × × × × = = = φ λ hc hf KE 50. An electron that is confined in a one-dimensional box is observed, at different times, to have velocities of -12*10 3 m/s, 27*10 3 m/s, and -40*10 3 m/s. What is the best estimate of the length of the box? a. 5 * 10 -7 m b. 5 * 10 -5 m c. 5 * 10 -1 m d. 5 * 10 -9 m e. 5 * 10 -3 m Δ v ~20-30* 10 3 m/s => Δ p = 9.11 × 10 -31 *(20-30)* 10 3 m/s = 1.8 to 2.5 × 10 -26 kg.m/s Δ x ~(h/2 π )/ Δ p ~ 6.6 × 10 -34
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This note was uploaded on 02/11/2012 for the course PHYSICS 222 taught by Professor Ogilvie during the Fall '05 term at Iowa State.

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finalSp06_verAPartASoln - Phys 222 Spring 2006 Final, Tue...

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