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Q.

The work function of a metal is 31 eV. To eject a photoelectron of zero velocity from the surface of the metal the wavelength of incident light should be above 

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a

400A0

b

40A0

c

200A0

d

20A0

answer is A.

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Detailed Solution

λ(A0)=12400 eV31 eV = 400

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The work function of a metal is 31 eV. To eject a photoelectron of zero velocity from the surface of the metal the wavelength of incident light should be above