Physics · Semiconductor and Electronic Devices

JEE Main 2024 — 9 April, Shift 1 — Question 35

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

Option A:
650 nm
Option B:
1243 nm
Option C:
875 nm
Correct
Option D:
1400 nm

Answer: C

Step-by-step solution

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

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 9 April, Shift 1
Subject: Physics
Chapter: Semiconductor and Electronic Devices
Topic: p-n Diode and its Applications