JEE Main 2022 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2022, Shift 1, Physics Q59

Question 59 of 90 in this shift, Physics question 29 of 30, Section B.

The energy band gap of semiconducting material to produce violet (wavelength

=4000

Å) LED is ______ eV. (Round off to the nearest integer).

Official answer

NTA final key (2022 Session 2).

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

9 Apr 2024, Shift 1 · Q48A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is $1.42$ eV. The wavelength of light emitted…EasySingle correct
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.