JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 27 June 2022, Shift 1, Physics Q46

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

An observer moves towards a stationary source of sound with a velocity equal to one-fifth of the velocity of sound. The percentage change in the frequency will be :

(1) $20\%$ Official answer
(2) $10\%$
(3) $5\%$
(4) $0\%$

Official answer

Option 1

NTA final key.

Chapter: Waves
Topic: Doppler Effect
Idea tested: Moving Observer Cases

Same topic in other shifts

All Doppler Effect questions

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11 Apr 2023, Shift 2 · Q31A car P travelling at $20\ \mathrm{ms^{-1}}$ sounds its horn at a frequency of $400\ \mathrm{Hz}$ . Another car Q is travelling behind the…MediumSingle correct
25 Jul 2022, Shift 1 · Q55An observer is riding on a bicycle and moving towards a hill at $18\ \mathrm{km\,h^{-1}}$ . He hears a sound from a source at some distance…MediumNumerical value
26 Jul 2022, Shift 1 · Q54When a car is approaching the observer, the frequency of horn is 100 Hz. After passing the observer, it is 50 Hz. If the observer moves…MediumNumerical value
28 Jul 2022, Shift 1 · Q57The frequency of echo will be __________ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h…MediumNumerical 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.