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Saturday, 31 October

JEE Main · Physics · Dual Nature of Radiation and Matter

Einstein's Photoelectric Equation

JEE Main asked Einstein's Photoelectric Equation 14 times in 14 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024 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, 2022 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
14
in 14 shifts
Years
5 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.10.20’170.08’200.14’210.17’220’230.14’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 4 in 24 shifts · 2022: 5 in 24 shifts · 2023: 0 in 12 shifts · 2024: 3 in 18 shifts · 2025: 0 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
  • 20250 of 8
  • 20243 of 18
  • 20230 of 12
  • 20225 of 24
  • 20214 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: calculation.

  • Work function from stopping potential
  • Max kinetic energy from photon energy

Difficulty

Easy 6Medium 8Hard 0

4 of the 14 questions had a numerical answer.

Every question

All 14 questions

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

  1. 5 Apr 2026, Shift 1 · Q41Light source having wavelength 331 nm is used to generate photo-electrons whose stopping potential is 0.2 V. The work function of the used…EasySingle correct
  2. 9 Apr 2024, Shift 2 · Q47UV light of 4.134.13 eV is incident on a photosensitive metal surface having work function 3.133.13 eV. The maximum kinetic energy of ejected…EasySingle correct
  3. 6 Apr 2024, Shift 1 · Q47In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work…EasySingle correct
  4. 4 Apr 2024, Shift 2 · Q47Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Number of photons…MediumAssertion–reason
  5. 29 Jun 2022, Shift 2 · Q36The electric field at a point associated with a light wave is given by…MediumSingle correct
  6. 28 Jun 2022, Shift 2 · Q47Let K1K_1 and K2K_2 be the maximum kinetic energies of photo-electrons emitted when two monochromatic beams of wavelength λ1\lambda_1 and…MediumSingle correct
  7. 24 Jun 2022, Shift 1 · Q56When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is v1v_1.…MediumNumerical value
  8. 29 Jul 2022, Shift 1 · Q46The kinetic energy of emitted electron is E when the light incident on the metal has wavelength λ\lambda. To double the kinetic energy,…MediumSingle correct
  9. 28 Jul 2022, Shift 2 · Q17Two streams of photons, possessing energies equal to five and ten times the work function of metal are incident on the metal surface…EasySingle correct
  10. 17 Mar 2021, Shift 2 · Q14Two identical photocathodes receive the light of frequencies f1f_1 and f2f_2 respectively. If the velocities of the photo-electrons coming…MediumSingle correct
  11. 26 Feb 2021, Shift 2 · Q24Two stream of photons, possessing energies equal to twice and ten times the work function of metal are incident on the metal surface…MediumNumerical value
  12. 26 Aug 2021, Shift 2 · Q52A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3×10144.3 \times 10^{14} Hz.…EasyNumerical value
  13. 3 Aug 2021, Shift 1 · Q25A photoelectric metal of work function 1 eV is used for photoelectric effect. When a radiation of wavelength 621 nm is incident on the…EasyNumerical value
  14. 8 Jan 2020, Shift 1 · Q17When photon of energy 4.0 eV strikes the surface of a metal A, the ejected photoelectrons have maximum kinetic energy TAT_A eV and…MediumSingle correct

Shifts: 8 Jan 2020, Shift 1, 26 Feb 2021, Shift 2, 17 Mar 2021, Shift 2, 3 Aug 2021, Shift 1, 26 Aug 2021, Shift 2, 24 Jun 2022, Shift 1, 28 Jun 2022, Shift 2, 29 Jun 2022, Shift 2, 28 Jul 2022, Shift 2, 29 Jul 2022, Shift 1, 4 Apr 2024, Shift 2, 6 Apr 2024, Shift 1, 9 Apr 2024, Shift 2, 5 Apr 2026, Shift 1.

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