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Question

The minimum energy necessary to overcome the attractive force between the electron and the surface of silver metal is 7.52 × 1019 J. What will be the maximum kinetic energy of the electrons ejected from silver which is being irradiated with ultraviolet light having a wavelength 360 Å?


A

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B

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C

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D

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Solution

The correct option is B


From Planck's Theory,

E = hv = hcλ

Therefore,

Energy absorbed = hcλ

= 6.625 × 1034 × 3.0 × 1010360 × 108

= 5.52 × 1018 joule

Now this energy is used in overcoming forces of attraction between surface of metal and imparting velocity to electron, therefore,

Eabsorbed = E used in attractive forces + Kinetic energy of electron

Kinetic energy = 5.52 × 1018 7.52 × 1019 joule

= 47.68 × 1019 joule


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