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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceAssertion–reasonEasyConceptual

JEE Main 29 June 2022, Shift 1, Physics Q37

Question 37 of 90 in this shift, Physics question 7 of 30, Section A.

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The photoelectric effect does not takes place, if the energy of the incident radiation is less than the work function of a metal. Reason R : Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal. In the light of the above statements, choose the most appropriate answer from the options given below.
  1. (1)Both A and R are correct and R is the correct explanation of A
  2. (2)Both A and R are correct but R is not the correct explanation of AOfficial answer
  3. (3)A is correct but R is not correct
  4. (4)A is not correct but R is correct

Official answer

Option 2

NTA final key (2022 Session 1).

Chapter
Dual Nature of Radiation and Matter
Topic
Photoelectric Effect
Idea tested
Work Function and Threshold

Same idea in other shifts

Asked 10× in all
  1. 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
  2. 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
  3. 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
  4. 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
  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. 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
  7. 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
  8. 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

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.