JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 9 April 2024, Shift 1, Physics Q48

Question 48 of 90 in this shift, Physics question 18 of 30, Section A.

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 :

(1) $1400$ nm
(2) $1243$ nm
(3) $650$ nm
(4) $875$ nmOfficial answer

Official answer

Option 4

NTA final key.

Chapter: Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic: Semiconductor Diodes
Idea tested: LED Bandgap and Emission Wavelength

Same idea in other shifts

Asked 3× in all

25 Jul 2022, Shift 1 · Q59The energy band gap of semiconducting material to produce violet (wavelength $=4000$ Å) LED is ______ eV. (Round off to the nearest…EasyNumerical value
3 Sep 2020, Shift 2 · Q19If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is : Planck's constant…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.