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Saturday, 31 October

JEE Main · Physics · Dual Nature of Radiation and Matter

Time Rate of Change of Wavelength

JEE Main asked Time Rate of Change of Wavelength 3 times in 3 of the 108 shifts Lumi analysed, in 2020, 2022 and 2025. It belongs to Matter Waves, in Dual Nature of Radiation and Matter (Physics). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
3 of 8
First asked
2020
last in 2025
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2022 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200’210.03’220’230’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20210 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: multi-step.

  • Time dependence of wavelength in field
  • Rate of change of de broglie wavelength in field

Difficulty

Easy 0Medium 3Hard 0

1 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. 8 Apr 2025, Shift 2 · Q50An electron is released from rest near an infinite non-conducting sheet of uniform charge density '−σ-\sigma' .The rate of change of…MediumNumerical value
  2. 27 Jul 2022, Shift 1 · Q47An electron (mass m) with an initial velocity v⃗=v0i^\vec{v}=v_0\hat{i} (v0>0v_0>0) is moving in an electric field E⃗=−E0i^\vec{E}=-E_0\hat{i}…MediumSingle correct
  3. 9 Jan 2020, Shift 2 · Q18An electron of mass mm and magnitude of charge ∣e∣|e| initially at rest gets accelerated by a constant electric field EE. The rate of…MediumSingle correct

Shifts: 9 Jan 2020, Shift 2, 27 Jul 2022, Shift 1, 8 Apr 2025, Shift 2.

Same topic

Other ideas in Matter Waves

Matter Waves has 20 ideas JEE Main has asked; 9 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas