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Q.11. A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo electron is
(1) 4.81 V
(2) 3.74 V
(3) 2.65 V
(4) 1.07 V

Dear Student,

φ=1.07 eV, λ=332 nm maximum KE=hcλ-φ=4.136*10-15*3*108332*10-9-1.07=2.667 eVvoltage required to stope the electron V=2.667eVe=2.667 Voption 3Regards

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