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Q.

when an electromagnetic radiation of wavelength 300 nm falls on the surface of metal electrons are ejected with a kinetic energy of 1.68 x 105 Jmol-1. Work function of the metal is 

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a

4.946 x 10-19 J

b

3.836 x 10-19 J

c

4.946 x 105J

d

3.836 x 105 J

answer is C.

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Detailed Solution

Ephoton =w + KE

KE per photon = 1.68×1056.02×1023=2.79×10-19

W = 6.625×10-34×3×108300×10-9-2.79×10-19=3.836 x 10-19J

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when an electromagnetic radiation of wavelength 300 nm falls on the surface of metal electrons are ejected with a kinetic energy of 1.68 x 105 Jmol-1. Work function of the metal is