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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. The band gap (in eV) for the semiconductor is `[hc=1242 eV nm]`

A

`1.1 eV`

B

`2.5 eV`

C

`0.5 eV`

D

`0.7 eV`

Text Solution

Verified by Experts

The correct Answer is:
C
Energy band `= (12400(eV-Å))/(lamda(Å))=(12400)/(24800)=0.5eV`.
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