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# The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor is0.90.70.51.1

A
0.9
B
0.5
C
1.1
D
0.7
Solution
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#### Band gap, Eg=hcλ=(6.63×10−34)(3×108)2480×10−9×1.6×10−19eV=0.5 eV

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