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On a photosensitive material, when freq...

On a photosensitive material, when frequency of incident radiation is increased by 30% kinetic energy of emitted photoelectrons increases from `0.4 eV` to `0.9 eV`. The work function of the surface is

A

1eV

B

1.267eV

C

1.4eV

D

1.8eV

Text Solution

Verified by Experts

The correct Answer is:
B
`hv=0.4+W_(0) .....(i)`
`1.3 hv=0.9+W_(0) .....(ii)`
(ii)-1.3 (i) gives
`0.3 W_(0)=0.9-1.3 (0.4)`
`therefore W_(0)=(0.38)/(0.3)=1.267eV`
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Knowledge Check

  • When the energy of the incident radiation is increased by 20 % , kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV . The work function of the metal is

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