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Q. The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480\, nm$, is incident on it. The band gap in ($eV$) for the semiconductor is:

AIEEEAIEEE 2005Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

$E_{g}=h\,v$
$=\frac{h\,c}{\lambda}=\left(\frac{6.63\times10^{-34}\times3\times10^{8}}{2480\times10^{-9}\times1.6\times10^{-19}}\right)eV$
$=0.5\,eV$