JEE Main 2019PhysicsWaves and SoundMediumMCQ

JEE Main 2019 — Waves and Sound Question with Solution

JEE Main 2019 (12 Apr Shift 2)

Question

Two sources of sound S1 and S2 produce sound waves of same frequency 660 Hz. A listener is moving from source S1 towards S2 with a constant speed u0 m/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u0 equals:

Choose an option

Show full solutionCorrect option: B
Correct answer
B2.5 m/s

Step-by-step explanation


Frequency observed from S1:     f1=660330-u0330-0
Frequency observed from S2:     f2=660330+u0330-0
As f2-f1=10
660330+u0330-0-330-u0330-0=10
22u0=10
u0=2.5 m/s

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About this question

This is a previous-year question from JEE Main 2019, covering the Waves and Sound chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.