1.

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 materialis nearly ……

Answer»

`10xx10^(14)HZ`
`5xx10^(14)Hz`
`1xx10^(14)Hz`
`20xx10^(14)Hz`

Solution :`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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