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JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 26 June 2022, Shift 2, Physics Q46

Question 46 of 90 in this shift, Physics question 16 of 30, Section A.

For a specific wavelength 670 nm of light coming from a galaxy moving with velocity

v

, the observed wavelength is 670.7 nm. The value of

v

is :

(1) $3 \times 10^{8}\ ms^{-1}$
(2) $3 \times 10^{10}\ ms^{-1}$
(3) $3.13 \times 10^{5}\ ms^{-1}$ Official answer
(4) $4.48 \times 10^{5}\ ms^{-1}$

Official answer

Option 3

NTA final key.

Chapter: Wave Optics
Topic: Doppler Effect
Idea tested: Light Doppler Approximation

Same idea in other shifts

Asked 2× in all

18 Mar 2021, Shift 2 · Q27A galaxy is moving away from the earth at a speed of 286 kms $^{-1}$ . The shift in the wavelength of a redline at 630 nm is…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.