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Saturday, 31 October

JEE Main · Physics · Atoms

Wavelengths in Cascade Transitions

JEE Main asked Wavelengths in Cascade Transitions once in the 108 shifts Lumi analysed, on 2 Apr 2017 (offline). It belongs to Bohr's Atomic Model, in Atoms (Physics).

Updated 2026-10-24

Times asked
1
in 1 shift
Years
1 of 8
First asked
2017
the only year
Pattern
Gone quiet
asked once so far

Questions on this idea a shift, by year

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

00.510.83’170’200’210’220’230’240’250’26

Raw count: 2017: 1 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20210 of 24
  • 20200 of 12
  • 20171 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 ratio from energy levels

Difficulty

Easy 1Medium 0Hard 0

The question was multiple choice.

Every question

The question

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

  1. 2 Apr 2017 (offline) · Q25Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths r=λ1/λ2r=\lambda_1/\lambda_2, is given by :EasySingle correctHas a figure

Shift: 2 Apr 2017 (offline).

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