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PHY2D_Quiz3 - short paragraphs maximum(b Derive the...

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QUIZ 3 PHYSICS 2D SPRING QUARTER 2009 Professor S.K.Sinha Formulas and constants h = 6.626 . 10 -34 J.s = 4.136. 10 -15 eV.s c = 3. 10 8 m/s e = 1.6. 10 -19 C m e = 9.1. 10 -31 Kg = 0.511 MeV/c 2 1 eV = 1.6. 10 -19 J Energy of photon E =hf λ f =c E 2 =p 2 c 2 + m 2 c 4 1. (a) Write down TWO experimental observations regarding light or electromagnetic radiation which classical physics was unable to explain (you will not get credit unless you state explicitly what it is that could not be explained and why). Be BRIEF (Not more than 2 short paragraphs maximum)
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Unformatted text preview: short paragraphs maximum) (b) Derive the equivalent of Plancks formula for the energy density (energy per unit volume) of radiation between frequencies f and f +df u ( f , T ) = 8 ! hf 3 c 3 ( 1 e hf / kT " 1 ) in terms of the energy density between wavelengths and + d . (The answer should be expressed only in terms of and T) 2. A photon of wavelength 1.8. 10 -7 m is absorbed on a Molybdenum surface (Work function = 4.2 eV) and emits a photoelectron . (a) Calculate the momentum of the incident photon in Kg.m/s (b) Calculate the velocity of the emitted photoelectron in m/s...
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