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Saturday, 31 October

JEE Main · Physics · Dual Nature of Radiation and Matter

Work Function and Threshold

JEE Main asked Work Function and Threshold 10 times in 9 of the 108 shifts Lumi analysed, in 2022, 2023, 2024 and 2025. It belongs to Photoelectric Effect, in Dual Nature of Radiation and Matter (Physics). The longest wait between two years asking it was 1 year. In 2022, 2024 and 2025 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
10
in 9 shifts
Years
4 of 8
First asked
2022
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2022, 2023, 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.150.30’170’200’210.17’220.07’230.09’240.25’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 5 in 24 shifts · 2023: 1 in 12 shifts · 2024: 2 in 18 shifts · 2025: 2 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
  • 20252 of 8
  • 20242 of 18
  • 20231 of 12
  • 202224 of 24
  • 20210 of 24
  • 20200 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.

  • Threshold wavelength from work function
  • Count correct statements on photoelectric effect

Difficulty

Easy 7Medium 3Hard 0

2 of the 10 questions had a numerical answer.

Every question

All 10 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 · Q52Which of the following statements are correct, if the threshold frequency of caesium is 5.16×10145.16 \times 10^{14} Hz? A. When Cs is placed…MediumOtherHas a figure
  2. 3 Apr 2025, Shift 1 · Q43The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons isEasySingle correct
  3. 31 Jan 2024, Shift 2 · Q46In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of…EasySingle correct
  4. 30 Jan 2024, Shift 1 · Q46The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this…EasySingle correct
  5. 13 Apr 2023, Shift 1 · Q45The difference between threshold wavelengths for two metal surfaces A and B having work function ϕA=9 eV\phi_A = 9\ eV and…EasySingle correct
  6. 29 Jun 2022, Shift 1 · Q37Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The photoelectric…EasyAssertion–reason
  7. 28 Jun 2022, Shift 1 · Q82If the work function of a metal is 6.63×10−196.63 \times 10^{-19}J, the maximum wavelength of the photon required to remove a photoelectron from…EasyNumerical value
  8. 26 Jun 2022, Shift 2 · Q47A metal surface is illuminated by a radiation of wavelength 4500 Å. The ejected photo-electron enters a constant magnetic field of 2 mT…MediumSingle correct
  9. 26 Jun 2022, Shift 2 · Q60The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 6630 Å is 0.42 V. If the threshold…MediumNumerical value
  10. 25 Jun 2022, Shift 2 · Q61The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is: [Given: The…EasySingle correct

Shifts: 25 Jun 2022, Shift 2, 26 Jun 2022, Shift 2, 28 Jun 2022, Shift 1, 29 Jun 2022, Shift 1, 13 Apr 2023, Shift 1, 30 Jan 2024, Shift 1, 31 Jan 2024, Shift 2, 3 Apr 2025, Shift 1, 7 Apr 2025, 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