How does quantum theory explain the working of a photocell?
A. Each photon of light with an energy below a certain value releases
an electron from an atom.
B. An electron is only released from an atom when struck by a
photon of light with a certain minimum energy.
C. Each electron is released from an atom when a light wave with a
certain minimum energy strikes it.
D. Each light wave with an energy below a certain value releases an
electron from an atom.
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The energy of a photon depends on radiation frequency; there are photons of all energies from high-energy gamma- and X-rays, through visible light, to low-energy infrared and radio waves. All photons travel at the speed of light.
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