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Saturday, 31 October

JEE Main · Chemistry · Structure of Atom

Circumference and De Broglie Wavelength

JEE Main asked Circumference and De Broglie Wavelength 3 times in 3 of the 108 shifts Lumi analysed, in 2021, 2023 and 2024. It belongs to Bohr's Atomic Theory, in Structure of Atom (Chemistry). 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
2021
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2023 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200.03’210’220.07’230.05’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 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
  • 20231 of 12
  • 20220 of 24
  • 20211 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • De broglie wavelength in 4th orbit in units of pi a0
  • De broglie wavelength in a bohr orbit

Difficulty

Easy 1Medium 2Hard 0

2 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. 4 Apr 2024, Shift 1 · Q81The de-Broglie's wavelength of an electron in the 4th4^{\mathrm{th}} orbit is ________ πa0\pi a_0. (a0a_0 = Bohr's radius)MediumNumerical value
  2. 6 Apr 2023, Shift 2 · Q62If the radius of the first orbit of hydrogen atom is aoa_o, then de Broglie's wavelength of electron in 3rd3^{rd} orbit isEasySingle correct
  3. 24 Feb 2021, Shift 1 · Q53A proton and a Li3+\mathrm{Li^{3+}} nucleus are accelerated by the same potential. If λLi\lambda_{\mathrm{Li}} and λp\lambda_{\mathrm{p}}…MediumNumerical value

Shifts: 24 Feb 2021, Shift 1, 6 Apr 2023, Shift 2, 4 Apr 2024, Shift 1.

Same topic

Other ideas in Bohr's Atomic Theory

Bohr's Atomic Theory has 14 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