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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumApplication

JEE Main 7 April 2025, Shift 1, Chemistry Q52

Question 52 of 75 in this shift, Chemistry question 2 of 25, Section A.

Which 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 inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs, the ammeter shows the presence of current. B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced. C. When a red light is used instead of the yellow light, the current produced is higher with respect to the yellow light. D. When a blue light is used, the ammeter shows the formation of current. E. When a white light is used. the ammeter shows formation of current. Choose the correct answer from the options given below:

The figure, in words

Image of the visible spectrum (colour band from violet to red) with a wavelength axis in nanometers marked 400, 500, 600, 700, 750.
  1. (1)B, C and D Only
  2. (2)A, C, D and E Only
  3. (3)A, D and E Only
  4. (4)A, B, D and E OnlyOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Structure of Atom
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. 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
  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. 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
  5. 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
  6. 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
  7. 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
  8. 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

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.