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Q.

The photo electric threshold wavelength for a metal is 2750A .  The minimum energy of a photon that can produce photoelectric effect in the metal is

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a

0.045ev

b

0.45ev

c

4.5ev

d

0.0045ev

answer is C.

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Detailed Solution

Wavelength λ=2750A

Energy of the photon E=12400λev

=12,4002750ev

=4.5ev

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