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Question

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

A
6000
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B
4000
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C
4000 nm
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D
6000 nm
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Solution

The correct option is C 4000
We know that E=hcλmax

λmax=hcE=6.6×1034×3×1082.5×1.6×1019=5000A
The wavelength of signal must be less than λmax
λ=4000
Therefore the correct option is B

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