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A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is $1.42 \mathrm{eV}$. The wavelength of light emitted from the LED is :
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The correct answer is:
$875 \mathrm{~nm}$
$\lambda=\frac{1240}{1.42}=875 \mathrm{~nm}$ (Approx)
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