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The surface of a metal is illuminated with the light of `400 nm` The kinetic energy of the ejected photoelectron was found to be `1.68 eV`. The work function of the metal is :

A

1.51 eV

B

1. 42 eV

C

3.0 eV

D

1.68 eV

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The correct Answer is:
B
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Wave property of electrons implies that they will show diffraction effects. Davission and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure) The surface of a metal is illuminated with the light of 400 nm . The kinetic energy of the ejected photoelectrons was found to be 1.68 eV . The work function of the metal is : ( hc = 1240 eV-nm )

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