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

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

Solution:

$\lambda=\frac{h c}{E}=\frac{12400\, e v^{\circ} A}{2.5\, e V}$
$=4968^{\circ} \,A$