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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 &quot; 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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 Spring '08
 Hirsch
 Physics, Energy, Photon, Light, Energy density

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