JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 31 January 2024, Shift 2, Physics Q46

Question 46 of 90 in this shift, Physics question 16 of 30, Section A.

In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

(1)ZeroOfficial answer
(2)halved
(3)doubled
(4)quadrupled

Official answer

Option 1

NTA final key.

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

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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
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28 Jun 2022, Shift 1 · Q82If the work function of a metal is $6.63 \times 10^{-19}$ J, the maximum wavelength of the photon required to remove a photoelectron from…EasyNumerical 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.