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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); σ = 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 Δ λ = h mc (1- cos θ ); ρ T ( ν ) = 8 πν 2 c 3 hν e hν/kT- 1 ; R T ( ν ) = c 4 ρ T ( ν ); R R T ( ν ) = σT 4 ; Z = ∑ j exp(- E j kT ); P ( E j ) = 1 Z exp(- E j kT ) λT = 2 . 9 × 10- 3 meter K; ν 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 = hν . 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 = nhν 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 ν,ν + dν . In various occasions we also gave the energy per mode as E =...
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Quiz1_solutions - 2601 Quiz 1 February 2010 Instructions...

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