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Question

Question: The electrical conductivity of a semi conductor increases when electronmagnetic radiation of wave le...

The electrical conductivity of a semi conductor increases when electronmagnetic radiation of wave length shorter than 2480 nm is incident on it. The band gap (in eV) for semiconductor is

A

0.90.9

B

0.70.7

C

0.50.5

D

1.11.1

Answer

0.50.5

Explanation

Solution

: Eg=hcλ=1240eVnm2480nm=0.5eVE_{g} = \frac{hc}{\lambda} = \frac{1240eVnm}{2480nm} = 0.5eV