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Q.

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-electrons is

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a

4.81 eV

b

3.74 eV

c

2.66 eV

d

1.07 eV

answer is C.

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Detailed Solution

Energy of incident light E(eV) =123753320=3.72  Volt332nm=3320AoAccording  to  the  relation  E=Wo+eVo⇒Vo=E−Woe=3.72eV−1.07eVe=2.65  Volt.
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