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In a photoelectric effect experiment, if f is the frequency of radiation incident on the metal surface and I is the intensity of the incident radiations, then mark the correct statement(s).

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If f is increased, keeping I and work function constant, then stopping potential and maximum kinetic energy of photoelectron increase

If I is increased, keeping f and work function constant, then stopping potential remains same and saturation current increases.

If distance between cathode and anode is only changed then stopping potential remains same.

Work function is decreased, keeping f and I constant, then stopping potential and maximum kinetic energy of photoelectrons increase.

answer is A, B, C, D.

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Detailed Solution

ABCD Intensity $I = \frac{n h f}{A}$ where n=no. of photons falling on the metal per second. Saturation photo current $i α n$
$K E_{\max} = h f - W_{0}$
Stopping potential $V_{0} = \frac{h}{e} f - \frac{W_{0}}{e}$

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