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Saturday, 31 October

JEE Main · Physics · Dual Nature of Radiation and Matter

Photon Energy and Momentum

JEE Main asked Photon Energy and Momentum 5 times in 5 of the 108 shifts Lumi analysed, in 2021, 2023, 2025 and 2026. It belongs to Photoelectric Effect, in Dual Nature of Radiation and Matter (Physics). The longest wait between two years asking it was 2 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 shifts
Years
4 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200.07’210’220.07’230’240.13’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20251 of 8
  • 20240 of 18
  • 20231 of 12
  • 20220 of 24
  • 20212 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.

  • Spectrum region from power and photon rate
  • Photoelectron circular path in magnetic field

Difficulty

Easy 2Medium 3Hard 0

2 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. 8 Apr 2026, Shift 2 · Q38A monochromatic source of light operating at 15 kW emits 2.5×10222.5 \times 10^{22} photons/s. The region of an electromagnetic spectrum to…MediumSingle correct
  2. 2 Apr 2025, Shift 1 · Q44A monochromatic light is incident on a metallic plate having work function ϕ\phi. An electron, emitted normally to the plate from a point…MediumSingle correct
  3. 13 Apr 2023, Shift 2 · Q60An atom absorbs a photon of wavelength 500500 nm and emits another photon of wavelength 600600 nm. The net energy absorbed by the atom in…MediumNumerical value
  4. 24 Feb 2021, Shift 1 · Q18Given below are two statements : Statement I : Two photons having equal linear momenta have equal wavelengths. Statement II : If the…EasyTwo statements
  5. 27 Aug 2021, Shift 2 · Q53The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1…EasyNumerical value

Shifts: 24 Feb 2021, Shift 1, 27 Aug 2021, Shift 2, 13 Apr 2023, Shift 2, 2 Apr 2025, Shift 1, 8 Apr 2026, Shift 2.

Same topic

Other ideas in Photoelectric Effect

Photoelectric Effect has 15 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