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Question

The work function of a metal is 1.6×1019J. When the metal surface is illuminated by the light of wavelength 6400A , then the maximum kinetic energy of emitted photo-electrons will be (Planck's constant h=6.4×1034 Js)


A

14×1019J

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B

2.8×1019J

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C

1.4×1019J

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D

1.4×1019eV

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Solution

The correct option is C

1.4×1019J


Kmax=hcλW0=6.4×1034×3×1086400×10101.6×1019
=1.4×1019J


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