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EXERCISE 16
(a) What is the energy, in joules, of a single photon of blue light with a wavelength of 350 nanometers? Remember that the speed of light in vacuum is 3.0 * 10^8 m/sec and that Planck's constant (the letter "h") is 6.63 * 10^(-34) kg m^2/sec. (b) A typical hydrogen atom will be ionized if it is struck by a photon carrying more than 2.1 * 10^(-18) joule of energy. What is the maximum wavelength of such a photon? What is the minimum wavelength? (c) What temperature would an object need to have for its thermal radiation spectrum to peak at photons carrying 2.1 * 10^(-18) joule of energy? How does this temperature compare to the temperature at the surface of the Sun? |