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The electrical conductivity of a semicon...

The electrical conductivity of a semiconductor increases when electromagnatic radiation of wavelength shorter than 2480 nm is incident on it. Find the band gap of the semiconductor. Given `h=6.63xx10^(-34)Js, and 1eV=1.6xx10^(-19)J`.

A

0.9 eV

B

1.2 eV

C

1.8 eV

D

0.5 eV

Text Solution

Verified by Experts

The correct Answer is:
D
`E_g=hv="hC"/lambda=(6.63xx10^(-34)xx3xx10^8)/(2500xx10^(-9)xx1.6xx10^(-19))`
`=(6.63xx3)/(25xx1.6)= 0.5` eV
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