Chapter 38: Q. 22 (page 1114)
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The maximum kinetic energy of photoelectrons is 2.8 eV. When the wavelength of the light is increased by 50%, the maximum energy decreases to 1.1 eV. What are (a) the work function of the cathode and (b) the initial wavelength of the light?
The cosmic microwave background radiation is light left over from the Big Bang that has been Doppler-shifted to microwave frequencies by the expansion of the universe. It now fills the universe with 450 photons/cm3 at an average frequency of 160 GHz. How much energy from the cosmic microwave background, in MeV, fills a small apartment that has 95 m2 of floor space and 2.5-m-high ceilings?
An FM radio station broadcasts with a power of 10 kW at a frequency of 101 MHz.
a. How many photons does the antenna emit each second?
b. Should the broadcast be treated as an electromagnetic wave or discrete photons? Explain.
How much energy does it take to ionize a hydrogen atom that is in its first excited state?
(a). What is the de Broglie wavelength of a baseball with a speed of ?
(b). What is the speed of a baseball with a de Broglie wavelength of ?
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