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If the frequency of the incident radiation on the cathode of a photocell is doubled, how will the following change? (a) Kinetic energy of electrons (b)

Photoelectric current State reasons to justify your answer.


Since number of photons per time interval is only dependent on the intensity, then only intensity affects the current. Higher frequencies may increase the energy of the ejected photoelectrons and make it cross a distance faster, but the time between each successive photoelectron remains the same because the time between each successive photon impact remains the same for the same intensity. It does not increase the total number of photoelectrons per photon.
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