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Unformatted text preview: Homework (1) for Physics 316, Modern Physics I (Hoffstaetter/Drasco/Thibault) Due Date: Friday, 02/04/05  09:05 in 132 Rockefeller Hall Exercise 1: Express Plancks radiation formula for the emitted power per area R T ( ) d = 2 h c 2 3 e h kT 1 d (1) in terms of the wavelength = c/ . The result should have the form R T ( ) d = F ( ) d , (2) for which you have to determine F ( ). (from [2, 2.2,2]) Exercise 2: a) A 1kW radio transmitter operates at a frequency of 900kHz. How many photons per second does it emit. Use Plancks formula for the energy per photon, E = h . (from [2, 2.3,7]) b) Approximate the emission of a 100W light bulb as that of a black body at 4000K. How many photons are emitted? You may use R x 3 / ( e x 1) dx = 4 / 15 and R x 2 / ( e x 1) dx = 2 (3) = 2 . 4. c) (Bonus) What fraction of the energy emitted by this bulb is in the visible region?...
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This note was uploaded on 09/28/2008 for the course PHYS 316 taught by Professor Hoffstaetter during the Spring '05 term at Cornell University (Engineering School).
 Spring '05
 HOFFSTAETTER
 Physics, Power, Work, Radiation

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