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Question

In a photoelectric-effect experiment, if ‘f’ is the frequency of incident radiation on the metal surface and I is the intensity of the incident radiation, then
  1. If ‘f’ is increased, keeping I and work function constant, then stopping potential and maximum kinetic energy of photoelectron increases.
  2. If distance between cathode and anode increases, stopping potential remains same.
  3. If ‘I’ is increased keeping ‘f’ and work function constant, saturation current increases but stopping potential remains same.
  4. Work function is decreased keeping f and I constant. Then, stopping potential and maximum kinetic energy of photoelectrons increases.


Solution

The correct options are
A If ‘f’ is increased, keeping I and work function constant, then stopping potential and maximum kinetic energy of photoelectron increases.
B If distance between cathode and anode increases, stopping potential remains same.
C If ‘I’ is increased keeping ‘f’ and work function constant, saturation current increases but stopping potential remains same.
D Work function is decreased keeping f and I constant. Then, stopping potential and maximum kinetic energy of photoelectrons increases.


If 'I' and work function are kept constant, then stopping potential and maximum kinetic energy of photoelectron increases.
Stopping potential is independent of the distance between cathode and anode.
If work function is decreased keeping f and I constant then, stopping potential and maximum kinetic energy of photoelectrons increases.
IF work function is decreased keeping f and I constant. Then, stopping potential and maximum kinetic energy of photoelectrons increases.

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