s02x3aan - 2 m) 10 kg)(5.0 10 2(9.11 s) J 10 63 . 6 ( 2...

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NAME PHYS-1200 PHYSICS II QUIZ 3 APRIL 17, 2002 SOLUTIONS PART A. 1. D 7. D 2. B 8. A 3. D 4. C 5. A 6. D PART B . 1. a) m 10 00 . 5 m 10 50 . 7 7 6 1 - - × × = = λ L N N 1 = 15 b) ) 15 )( 25 . 1 ( / 2 = = = L n n L N N 2 = 18.75 c) THEY ARE NEITHER IN PHASE NOR COMPLETELY OUT OF PHASE . N 2 N 1 = 3.75, which is neither an integer nor an integer plus ½. 2. a) The potential energy well is not infinitely deep. b) For the n = 1 state of an infinite well, = 2 L . In this case, the wavelength is longer than 2 L , so the well is of finite depth.
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NAME PART C . 1. a) d sin θ = m λ , so ° × = = - sin2.0 m) 10 0 . 5 ( 1 sin 8 m d d = 1.4 ×10 -6 m = 1.4 μ m b) a sin = m , so ° × = = - sin5.0 m) 10 0 . 5 ( 1 sin 8 m a a = 5.7 ×10 -7 m = 0.57 m c) 2 8 31 2 34 2 2
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Unformatted text preview: 2 m) 10 kg)(5.0 10 2(9.11 s) J 10 63 . 6 ( 2 2--- = = = m h m p E el E el = 9.65 10-23 J = 6.0 10-4 eV = 0.60 meV d) y = D tan = (0.50 m) tan 2.0 y = 1.7 10-2 m = 1.7 cm 2. a) m 10 550 m/s) 10 . 3 s)( J 10 63 . 6 ( 9 8 34-- = = = hc hf E ph E ph = 3.6 10-19 J = 2.3 eV b) YES . Since no photoelectrons come off, the work function has to be at least as large as the energy of the 550 nm photon. Therefore: min = 3.6 10-19 J = 2.3 eV...
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s02x3aan - 2 m) 10 kg)(5.0 10 2(9.11 s) J 10 63 . 6 ( 2...

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