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Saturday, 31 October

JEE Main · Physics · Atoms

Shortest and Longest Wavelengths

JEE Main asked Shortest and Longest Wavelengths 8 times in 8 of the 108 shifts Lumi analysed, in 2020, 2021, 2023, 2024 and 2025. It belongs to Bohr's Atomic Model, in Atoms (Physics). The longest wait between two years asking it was 2 years. In 2021 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
8
in 8 shifts
Years
5 of 8
First asked
2020
last in 2025
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200.07’210’220.07’230.14’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 2 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 3 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
  • 20243 of 18
  • 20231 of 12
  • 20220 of 24
  • 20212 of 24
  • 20201 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 longest wavelengths of two spectral series
  • Ratio of series limit wavelengths

Difficulty

Easy 4Medium 4Hard 0

4 of the 8 questions had a numerical answer.

Every question

All 8 questions

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

  1. 7 Apr 2025, Shift 1 · Q43For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series isEasySingle correct
  2. 6 Apr 2024, Shift 2 · Q48The longest wavelength associated with Paschen series is : (Given RH=1.097×107R_H=1.097\times10^7 SI unit)EasySingle correct
  3. 6 Apr 2024, Shift 1 · Q48The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is :EasySingle correct
  4. 5 Apr 2024, Shift 2 · Q60The shortest wavelength of the spectral lines in the Lyman series of hydrogen spectrum is 915 A˚\mathrm{\AA}. The longest wavelength of…MediumNumerical value
  5. 10 Apr 2023, Shift 2 · Q56If 917 A˚\mathrm{\AA} be the lowest wavelength of Lyman series then the lowest wavelength of Balmer series will be ____________…EasyNumerical value
  6. 24 Feb 2021, Shift 1 · Q17In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked A, B, C, D and E. The…MediumDiagram basedHas a figure
  7. 3 Aug 2021, Shift 2 · Q23The ratio of shortest wavelength to the largest wavelength in Brackett series of atomic spectra for hydrogen atom is x:25x : 25, where the…MediumNumerical value
  8. 4 Sep 2020, Shift 1 · Q25In the line spectra of hydrogen atom, difference between the largest and the shortest wavelengths of the Lyman series is 304 Å. The…MediumNumerical value

Shifts: 4 Sep 2020, Shift 1, 24 Feb 2021, Shift 1, 3 Aug 2021, Shift 2, 10 Apr 2023, Shift 2, 5 Apr 2024, Shift 2, 6 Apr 2024, Shift 2, 6 Apr 2024, Shift 1, 7 Apr 2025, Shift 1.

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