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When light of energy 2.5 eV falls on a m...

When light of energy 2.5 eV falls on a metal surface, the maximum K.E. of the emitted electrons is T. If the radiation of energy 4eV is made incident on the same metal surface, the K.E. of the electrons is doubled. What is the work function of the metal ?

A

0.5 eV

B

1 eV

C

1.5 eV

D

2 eV

Text Solution

Verified by Experts

The correct Answer is:
B
`(K_(1))/(K_(2))=(E_(1)-W_(0))/(E_(2)-W_(0)) :. 1/2 = (2.5-W_(0))/(4-W_(0))`
`:.5-2W_(0)=4-W_(0):.W_(0)=1eV`
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