In photoelectric emission process from a metal of work function 1.8 eV the kinetic energy of most energetic electrons is 0.5 eV.
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The calculation will be framed thus:
The answer is B. 0.5 V. The reason is that stopping potential= maximum Kinetic energy
eV= KE max
stopping potential= maximum Kinetic energy
eV=KE maximum
stopping potential is usually the speed required to stop a moving electron that has the maximum amount of kinetic energy. This actually stops the electron from reaching out to the other side of the plate.
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