Learn

Saturday, 31 October

JEE Main · Physics · Atoms

Bohr Orbit Radius

JEE Main asked Bohr Orbit Radius 6 times in 6 of the 108 shifts Lumi analysed, in 2022, 2023, 2024 and 2025. It belongs to Bohr's Atomic Model, in Atoms (Physics). The longest wait between two years asking it was 1 year. In 2023 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
6
in 6 shifts
Years
4 of 8
First asked
2022
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2022, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.150.30’170’200’210.03’220.21’230.05’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 3 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20241 of 18
  • 20233 of 12
  • 20221 of 24
  • 20210 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.

  • Ratio of quantity in two orbits
  • Orbit radius of hydrogen-like ion

Difficulty

Easy 5Medium 1Hard 0

3 of the 6 questions had a numerical answer.

Every question

All 6 questions

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

  1. 2 Apr 2025, Shift 2 · Q40Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of Li++\mathrm{Li^{++}} ion in its ground state is given by…EasySingle correct
  2. 27 Jan 2024, Shift 1 · Q47The radius of third stationary orbit of electron for Bohr's atom is R. The radius of fourth stationary orbit will be :EasySingle correct
  3. 13 Apr 2023, Shift 1 · Q51The radius of 2nd2^{\text{nd}} orbit of He+\mathrm{He^+} of Bohr's model is r1r_1 and that of fourth orbit of Be3+\mathrm{Be^{3+}} is…EasyNumerical value
  4. 6 Apr 2023, Shift 2 · Q56Experimentally it is found that 12.8 eV energy is required to separate a hydrogen atom into a proton and an electron. So the orbital…MediumNumerical value
  5. 6 Apr 2023, Shift 1 · Q53The radius of fifth orbit of the Li++\mathrm{Li^{++}} is ____________ ×10−12\times10^{-12} m. Take: radius of hydrogen atom = 0.51 ÅEasyNumerical value
  6. 30 Jul 2022, Shift 2 · Q17Using Boh'r model of quantization of angular momentum the relation between the radius 'r' of the nth^{\mathrm{th}} allowed orbit of…EasySingle correct

Shifts: 30 Jul 2022, Shift 2, 6 Apr 2023, Shift 2, 6 Apr 2023, Shift 1, 13 Apr 2023, Shift 1, 27 Jan 2024, Shift 1, 2 Apr 2025, Shift 2.

Same topic

Other ideas in Bohr's Atomic Model

Bohr's Atomic Model has 22 ideas JEE Main has asked; 13 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas