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Saturday, 31 October

JEE Main · Physics · Semiconductor Electronics: Materials, Devices and Simple Circuits

LED Bandgap and Emission Wavelength

JEE Main asked LED Bandgap and Emission Wavelength 3 times in 3 of the 108 shifts Lumi analysed, in 2020, 2022 and 2024. It belongs to Semiconductor Diodes, in Semiconductor Electronics: Materials, Devices and Simple Circuits (Physics). The longest wait between two years asking it was 2 years.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
3 of 8
First asked
2020
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2022 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.050.10’170.08’200’210.03’220’230.05’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20241 of 18
  • 20230 of 12
  • 20221 of 24
  • 20210 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: calculation.

  • Wavelength emitted from band gap
  • Band gap from led wavelength

Difficulty

Easy 3Medium 0Hard 0

1 of the 3 questions had a numerical answer.

Every question

All 3 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 9 Apr 2024, Shift 1 · Q48A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.421.42 eV. The wavelength of light emitted…EasySingle correct
  2. 25 Jul 2022, Shift 1 · Q59The energy band gap of semiconducting material to produce violet (wavelength =4000=4000 Å) LED is ______ eV. (Round off to the nearest…EasyNumerical value
  3. 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

Shifts: 3 Sep 2020, Shift 2, 25 Jul 2022, Shift 1, 9 Apr 2024, Shift 1.

Same topic

Other ideas in Semiconductor Diodes

Semiconductor Diodes has 17 ideas JEE Main has asked; 10 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas