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The electrical conductivity of a semicon...

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

`0.7eV`

B

`0.5eV`

C

`2.5e V`

D

`1.2eV`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(g)=(hc)/(lambda)=(6.6xx10^(-34)xx3xx10^(8))/(2480xx10^(-9)xx(1.6xx10^(-19)))`
`=0.5eV`
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