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Unformatted text preview: Patrick Michael Meade- PHY 232 Spring 2007 1 Last Set (04/27 midnight) Due date: Fri 27 Apr 2007 11:59:00 PM EDT The temperature of the cosmic background radiation is mea- sured to be 2.7 K. What is the wavelength of the peak in the spectral distribution at this temperature? Tries 0/12 What frequency corresponds to this wavelength? Tries 0/12 Betelgeuse - the right shoulder star of Orion - is a red giant star. Its radiation peaks in the infrared at λ = 800 nm. What is the surface temperature of the star? Tries 0/12 Your favorite radio station broadcasts at a frequency of 95.9 MHz with a power of 23.5 kW. How many photons does the antenna of the station emit in each second? Tries 0/12 The work function of a certain metal is φ = 4.15 eV. Deter- mine the minimum frequency of light f for which photoelec- trons are emitted from the metal. (Planck’s constant is: h = 4 . 1357 × 10- 15 eVs.) Tries 0/12 Determine the corresponding wavelength of light. (Possibly useful constant: hc = 1240 eVnm.) Tries 0/12 Calculate the kinetic energy of the emitted electrons if the frequency of the photons is doubled to 2f . Tries 0/12 What is the wavelength of the most energetic photons pro- duced by an X-ray tube using U = 15.5 kV potential difference?...
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This homework help was uploaded on 04/10/2008 for the course PHY 232 taught by Professor Mr.nagy during the Spring '06 term at Michigan State University.
- Spring '06