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Will photo electron be emitted by a copper surface, whose threshold wave length is 2800 A° when illuminated by visible light ?

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Yes

Yes if light is very intense

Yes, if light is very bright

answer is A.

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Detailed Solution

Wavelength of visible light is more than 4000 $\overset{0}{A}$ if threshold wavelength is 2800 $\overset{0}{A}$ any wavelength less than 2800 $\overset{0}{A}$ will able to produce photoelectric effect.

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