A metal whose work function is 3.3eV is illuminated by light of wavelength 3×10−7 m. What is the threshold frequency for photoelectric emission? Given Planck's constant =6.6×10−34Js.
A
0.4×1015Hz
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B
0.8×1015Hz
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C
1.6×1015Hz
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D
3.2×1015Hz
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Solution
The correct option is B0.8×1015Hz Work function, W0=hν0=3.3eV=3.3×1.6×10−19J Therefore, the threshold frequency, ν0=W0h=3.3×1.6×10−196.6×10−34=0.8×1015Hz Hence, the correct choice is (b).