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Question

Electrical conductivity of a semiconductor increases when em radiation of λ<2480nm is incident on it. The band gap in (ev) for the semiconductor is

A
1.1eV
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B
2.5eV
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C
0.7eV
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D
0.5eV
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Solution

The correct option is B 0.5eV
Maximum wavelength required for the electrical conductivity of the semiconductor: λmax=2480nm=2480×109 m
Thus threshold frequency of the radiation: ν=cλmax
Energy band gap for the semiconductor: Egap=hν
Egap=6.63×1034×3×1082480×109J
Egap=8.02×1020J
Egap=8.02×10201.6×1019eV
Egap=0.5eV

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