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JEE Main 20249 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
9 April
Shift
Morning Shift
Subject
Physics
Chapter
Semiconductors

JEE Main 2024 · 9 April · Morning Shift · Physics · Semiconductors

A light emitting diode (LED) is fabricated using GaAs...

A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42eV1.42 \mathrm{eV}. The wavelength of light emitted from the LED is :

Options

  1. A1400 nm1400 \mathrm{~nm}
  2. B650 nm650 \mathrm{~nm}
  3. C875 nm875 \mathrm{~nm}
  4. D1243 nm1243 \mathrm{~nm}

Correct answer

C. 875 nm875 \mathrm{~nm}

Step-by-step solution

λ=12401.42=875 nm\lambda=\frac{1240}{1.42}=875 \mathrm{~nm} (Approx)
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