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The electrical conductivity of a semicon...

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than `1240 nm` is incident on it. The forbidden band energy for the semi conductor is (in eV).

A

`0.5`

B

`0.97`

C

`0.7`

D

`1.1`

Text Solution

Verified by Experts

The correct Answer is:
B
`E=(hc)/(lamda)=(12000)/(12400 Å)(e_(v)), 2.n_(e) gt n_(h)`.
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