A p-n photodiode is fabricated from a semiconductor with a band gap of $2.5 \mathrm{eV}$. It can detect a…
A p-n photodiode is fabricated from a semiconductor with a band gap of $2.5 \mathrm{eV}$. It can detect a signal of wavelength :
- $4960 Å$
- $6000 Å$
- $4000 \mathrm{~nm}$
- $6000 \mathrm{~nm}$
Solution
$\begin{aligned}
\lambda_{\max } & =\frac{\mathrm{hc}}{\mathrm{eV}} \\
& =\frac{1242 \mathrm{eV} Å}{2.5 \mathrm{eV}}=4960 Å
\end{aligned}$
Asked in: NEET 2009 (Mains)
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