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If the wave length of light in an experiment on photo electric effect is doubled keeping the intensity constant

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The photo electrons may or may not be emitted

The stopping potential decreases if electrons are emitted

The photo electric current does not change if electrons are emitted

All the above

answer is D.

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Detailed Solution

P.E.E takes place, of $λ \leq λ_{0}$ . Photo current is proportional to intensity.

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