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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?
1.2 eV
2.8 eV
4.0 eV
6.8 eV
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If a photon has a momentum of 4.42?10?27 kg m/s, what is its frequency?
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