CBSE Class 12 Physics 2023 Outside Delhi Set 2 Paper

Question : 7

Total: 13

A photon of wavelengths 663‌nm is incident on a metal surface. The work function of the metal is 1.50‌eV. The maximum kinetic energy of the emitted photo electrons is

3.0×10−20J
6.0×10−20J
4.5×10−20J
9.0×10−20J

Solution: 👈: Video Solution

‌hv=ϕ0+KEmax
or, ‌‌

=ϕ0+KEmax
or, ‌

6.62×10−34×3×108

663×10−9

=1.5×1.6×10−19+KEmax
∴‌‌KEmax‌=0.6×10−19
‌=6×10−20J

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