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If a light source emits 1.0?1019 photons per second, and each photon has energy 3.0?10?19 J, what is the power of the source?
3.0 W
30 W
0.3 W
300 W
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A metal surface has a work function of 2.8 eV. What is the maximum kinetic energy of photoelectrons if 4.0 eV photons strike the surface?
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The kinetic energy of an electron ejected from a metal is 3.2?10?19 J. If the work function is 1.6?10?19 J, what is the energy of the incident photon?
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