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Work function of a metal is 3.9 eV/atom. Maximum kinetic energy of photo electrons when the metal is bombarded with a radiation of wavelength 200 nm is

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a
3.9 eV/atom
b
2.3 eV/atom
c
1.6 eV/atom
d
2.9 eV/atom

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detailed solution

Correct option is B

Energy of incident ray eV/atom =1240λ(nm)=1240200=6.2 eV/atom ; K.Emax=Eincident-W.F ; K.Emax=6.2-3.9 eV/atom ;

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