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 A 0.9 B 0.7 C 0.5 D 1.1 Medium

 Question:  From NCERT  | AIIMS 2013   || [Difficult level:Medium] Subtopic:Energy Bands || 

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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 is

A

0.9

B

0.7

C

0.5

D

1.1

Medium

Answer: .Correct option is C)

Band gap, Eg​=λhc​=2480×10−9×1.6×10−19(6.63×10−34)(3×108)​eV=0.5 eV

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