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A p-n photodiode is fabricated from a se...

A `p-n` photodiode is fabricated from a semiconductor with a band gap of `2.5 eV`. It can detect a signal of wavelength

A

6000 Å

B

6000 nm

C

4000 nm

D

5000 Å

Text Solution

Verified by Experts

The correct Answer is:
D
The detection occurs only when the energy of incident photon greater than or equal to the energy band gap
`(hc)/lambda=2.5 eV`
`therefore lambda=(hc)/(2.5 eV)=(1240 eV)/(2.5 eV)=496 nm ~~ 5000 Å`
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