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Friday, 9 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 25 July 2022, Shift 1, Physics Q47

Question 47 of 90 in this shift, Physics question 17 of 30, Section A.

A metal exposed to light of wavelength 800800 nm and and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photo-electron doubles when light of wavelength 500500 nm is used. The workfunction of the metal is : (Take hc=1230hc=1230 eV-nm).
  1. (1)1.5371.537 eV
  2. (2)2.462.46 eV
  3. (3)0.6150.615 eVOfficial answer
  4. (4)1.231.23 eV

Official answer

Option 3

NTA final key (2022 Session 2).

Chapter
Dual Nature of Radiation and Matter
Topic
Photoelectric Effect
Idea tested
Solving via Two Wavelength Data Points

Same idea in other shifts

Asked 2× in all
  1. 8 Apr 2026, Shift 2 · Q43K1K_1 and K2K_2 be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength…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 42 of the 174 JEE Main shifts held from 2017 to 2026.