JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 28 June 2022, Shift 2, Physics Q47

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

Let

K_1

and

K_2

be the maximum kinetic energies of photo-electrons emitted when two monochromatic beams of wavelength

\lambda_1

and

\lambda_2

, respectively are incident on a metallic surface. If

\lambda_1=3\lambda_2

then :

(1) $K_1 > \frac{K_2}{3}$
(2) $K_1 < \frac{K_2}{3}$ Official answer
(3) $K_1 = \frac{K_2}{3}$
(4) $K_2 = \frac{K_1}{3}$

Official answer

Option 2

NTA final key.

Chapter: Dual Nature of Radiation and Matter
Topic: Photoelectric Effect
Idea tested: Einstein's Photoelectric Equation

Same idea in other shifts

Asked 14× in all

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24 Jun 2022, Shift 1 · Q56When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is $v_1$ .…MediumNumerical value
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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.