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A p-n photodiode is made of a material w...

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly ……

A

`10xx10^(14)Hz`

B

`5xx10^(14)Hz`

C

`1xx10^(14)Hz`

D

`20xx10^(14)Hz`

Text Solution

Verified by Experts

The correct Answer is:
B
`5xx10^(14)Hz`
`E_(g)=2.0eV=2xx1.6xx10^(-19)J`
`=hf`
`f=(Eg)/(h)=(2xx1.6xx10^(-19))/(6.62xx10^(-34))`
`=0.4833xx10^(15)S^(-1)`
`=4.833xx10^(14)Hz=5xx10^(14)Hz`
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