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Saturday, 31 October

JEE Main · Physics · Atoms

Number of Spectral Lines

JEE Main asked Number of Spectral Lines 5 times in 5 of the 108 shifts Lumi analysed, in 2021, 2023 and 2024. It belongs to Bohr's Atomic Model, in Atoms (Physics). The longest wait between two years asking it was 2 years. In 2023 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 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 Physics questions.

00.10.20’170’200.03’210’220.14’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 2 in 12 shifts · 2024: 2 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
  • 20242 of 18
  • 20232 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.

  • Spectral lines from excitation energy
  • Frequency from number of emission lines

Difficulty

Easy 3Medium 2Hard 0

3 of the 5 questions had a numerical answer.

Every question

All 5 questions

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

  1. 30 Jan 2024, Shift 1 · Q60A electron of hydrogen atom on an excited state is having energy En=−0.85E_n = -0.85 eV. The maximum number of allowed transitions to lower…EasyNumerical value
  2. 9 Apr 2024, Shift 2 · Q35A hydrogen atom in ground state is given an energy of 10.210.2 eV. How many spectral lines will be emitted due to transition of electrons ?EasySingle correct
  3. 12 Apr 2023, Shift 1 · Q48A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:MediumSingle correct
  4. 11 Apr 2023, Shift 1 · Q51A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit…MediumNumerical value
  5. 27 Aug 2021, Shift 2 · Q29X different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are exited to states with principal quantum…EasyNumerical value

Shifts: 27 Aug 2021, Shift 2, 11 Apr 2023, Shift 1, 12 Apr 2023, Shift 1, 30 Jan 2024, Shift 1, 9 Apr 2024, 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