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Q.

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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a

No

b

Yes

c

Yes if light is very intense

d

Yes, if light is very bright

answer is A.

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Detailed Solution

W=12400λ in A0eV=124002800=4.43eV<4.47eVWork function of copper is 4.47eV
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