Quiz1_solutions

Quiz1_solutions - 2601 Quiz 1 February, 2010 Instructions...

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Unformatted text preview: 2601 Quiz 1 February, 2010 Instructions This is a closed book exam; calculators are not allowed; no sheets or cards are allowed When necessary you can leave unsolved numerical expressions such as ln(2) , e- 3 , 3 5 / 2 , 8 When necessary you can approximate your numerical answer such as 330 270 1 . 2 , 4 . 2 3 . 3 13 (14 or 15 are also good); anything within 20% is fine. Solve the mulitple choice problems on the bubble sheet. Turn in ONLY bubble sheet. Numerical Values + Constants: e- 1 = 0 . 368; e- 2 = 0 . 135; k = 1 . 38 10- 23 j/K; R = 8 . 31 j/(mole K); = 5 . 67 10- 8 W/(m 2 K 4 ); m e = 0.511 MeV/c 2 = 9 . 1 10- 31 kg; m p = 938 MeV/c 2 = 1 . 67 10- 27 kg; h = 6 . 626 10- 34 joule -sec = 4 . 14 10- 15 eV-sec; ~ = 0 . 66 10- 15 eV-sec; c = 3 10 8 m/sec; e = 1 . 6 10- 19 coulomb; Physics = h mc (1- cos ); T ( ) = 8 2 c 3 h e h/kT- 1 ; R T ( ) = c 4 T ( ); R R T ( ) = T 4 ; Z = j exp(- E j kT ); P ( E j ) = 1 Z exp(- E j kT ) T = 2 . 9 10- 3 meter K; T = 5 . 9 10 10 Hz/K; Conversions 1 atmosphere = 1 . 013 10 5 Pascal; 1 liter = 10- 3 m 3 ; 1 eV = 1 . 6 10- 19 joule; Phys2601 MULTIPLE CHOICE PROBLEMS 16 Questions, 5 points each, total points: 80 1. The photo-electric effect requires the existence of photons of energy E = h . These are not quite the same kind of photons that provide the energy in a black body because in a black body each photon has an energy E = nh n = 0 , 1 , 2 , 3 ,... . (a) true (b) false 2. When we developed the theory of spectral energy density in a cavity we counted the number of modes n available at the interval of frequency , + d . In various occasions we also gave the energy per mode as E =...
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This note was uploaded on 02/20/2010 for the course PHYS 2601 taught by Professor Shaulhanany during the Spring '10 term at Minnesota.

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Quiz1_solutions - 2601 Quiz 1 February, 2010 Instructions...

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