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When ultraviolet radiation of a certain ...

When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped completely by a retarding potential of 0.5 V. If the frequency of the radiation is increased by 10 %, this stopping potential rises to 0.9 V. The work function of potassium is

A

2.0 eV

B

2.4 eV

C

3.0 eV

D

2.8 eV

Text Solution

Verified by Experts

The correct Answer is:
B
`E = phi + eV`
`E = phi + e(0.9) 1.1 E = phi + e(0.9) 1E = 0.3 e`
`E = 3eV` put `phi = 2.4 eV`
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