JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 26 June 2022, Shift 2, Physics Q47

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

A metal surface is illuminated by a radiation of wavelength 4500 Å. The ejected photo-electron enters a constant magnetic field of 2 mT making an angle of 90°with the magnetic field. If it starts revolving in a circular path of radius 2 mm, the work function of the metal is approximately :

(1)1.36 eVOfficial answer
(2)1.69 eV
(3)2.78 eV
(4)2.23 eV

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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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.