A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is $1.42…

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 :
  1. $1400 \mathrm{~nm}$
  2. $650 \mathrm{~nm}$
  3. $875 \mathrm{~nm}$
  4. $1243 \mathrm{~nm}$

Solution

$\lambda=\frac{1240}{1.42}=875 \mathrm{~nm}$ (Approx)

Asked in: JEE Main 2024 (09 Apr Shift 1)

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