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Q.

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

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a

All the above

b

The stopping potential decreases if electrons are emitted

c

The photo electrons may or may not be emitted

d

The photoelectric current does not change if electrons are emitted

answer is D.

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Detailed Solution

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If the wavelength of photon is doubled frequency and energy of the photon becomes halved. If the frequency is still more than threshold frequency then photoelectric current remains same. As frequency is decreased stopping potential also decreases.

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