1.

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 isA. 2.0 eVB. 2.4 eVC. 3.0 eVD. 2.8 eV

Answer» Correct Answer - 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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