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Question

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 is
  1. 0.9
  2. 0.7
  3. 0.5
  4. 1.1

A
0.9
B
0.5
C
1.1
D
0.7
Solution
Verified by Toppr

Band gap, Eg=hcλ=(6.63×1034)(3×108)2480×109×1.6×1019eV=0.5 eV

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