The threshold wavelength for a metal surface is λ0. How is it related to the work function of the metal?
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The work function is the energy required to break an electron free from the metal surface. We know that the threshold frequency is the minimum frequency of the incident photon required for removing an electron from the metal surface. That is the energy of this photon should be equal to the work function of the metal.
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work function is equal to plank constant multipled by frequency. And frequency is inversely proportional to wavelength (lambda) so ...this is the answer
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