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A photodetectore is made from a semicond...

A photodetectore is made from a semiconductor. In `_(0.53)Ga_(-0.47)`As whith `E_(g)=0.73 eV`, what is the maximum wavelength which it can detect?

A

`1000nm`

B

`1703nm`

C

`500nm`

D

`173nm`

Text Solution

Verified by Experts

The correct Answer is:
b
Limiting value of `hV` is `E_(g)` such that `hV=(hc)/(lambda)=E_(g)`
or `lambda=(hc)/(E_(g))=(6.63xx10^(-34)J-sxx3xx10^(8)ms^(-1))/(0.73xx1.6xx10^(-9)J)`
`=1703nm`
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