Question

The work function of a metal is 2.5 eV. The maximum kinetic energy of the photoelectrons emitted if a radiation of wavelength 3000Ao falls on it is :

(h=6.63×1034 Js and c=3×108 m/s)

A
1.12×1019J
B
4.8×1019J
C
3.2×1019J
D
2.63×1019J
Solution
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Maximum kinetic energy, K.E.max=hcλϕ

=6.63×1034×3×1083000×10102.5×1.6×1019

=(6.63×10194×1019)J

=2.63×1019J.
So, the answer is option (D).

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