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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceAssertion–reasonMediumConceptual

JEE Main 4 April 2024, Shift 2, Physics Q47

Question 47 of 90 in this shift, Physics question 17 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: Number of photons increases with increase in frequency of light. Reason R: Maximum kinetic energy of emitted electrons increases with the frequency of incident radiation. 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 and R is NOT the correct explanation of A.
  3. (3)A is correct but R is not correct.
  4. (4)A is not correct but R is correct.Official answer

Official answer

Option 4

NTA final key.

Chapter
Dual Nature of Radiation and Matter
Topic
Photoelectric Effect
Idea tested
Einstein's Photoelectric Equation

Same idea in other shifts

Asked 14× in all
  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. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 29 Jun 2022, Shift 2 · Q36The electric field at a point associated with a light wave is given by…MediumSingle correct

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.