JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 3 September 2020, Shift 1, Physics Q18

Question 18 of 75 in this shift, Physics question 18 of 25.

When the wavelength of radiation falling on a metal is changed from 500 nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to :

(1)0.52 eV
(2)0.61 eVOfficial answer
(3)0.81 eV
(4)1.02 eV

Official answer

Option 2

NTA final key (Sep 2020).

Chapter: Dual Nature of Radiation and Matter
Topic: Photoelectric Effect
Idea tested: Two-Wavelength System of Equations

Same idea in other shifts

Asked 7× in all

2 Apr 2026, Shift 1 · Q42For a certain metal, when monochromatic light of wavelength $\lambda$ is incident, the stopping potential for photoelectrons is $3V_o$ .…MediumSingle correct
31 Jan 2024, Shift 1 · Q46When a metal surface is illuminated by light of wavelength $\lambda$ , the stopping potential is 8V. When the same surface is illuminated…MediumSingle correct
11 Apr 2023, Shift 1 · Q34A metallic surface is illuminated with radiation of wavelength $\lambda$ , the stopping potential is $V_0$ . If the same surface is…MediumSingle correct
4 Aug 2021, Shift 2 · Q3Two wavelengths $\lambda_1=496\,\mathrm{nm}$ and $\lambda_2=620\,\mathrm{nm}$ fall on a metal surface. Calculate the work function if the…MediumSingle correct
25 Feb 2021, Shift 2 · Q13The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the…MediumSingle correct
25 Jul 2021, Shift 2 · Q18When radiation of wavelength $\lambda$ is incident on a metallic surface, the stopping potential of ejected photoelectrons is 4.8 V. If…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.