JEE Main 2023PhysicsWaves and SoundHardMCQ

JEE Main 2023 — Waves and Sound Question with Solution

JEE Main 2023 (11 Apr Shift 2)

Question

A car P travelling at 20 m s-1 sounds its horn at a frequency of 400 Hz. Another car Q is travelling behind the first car in the same direction with a velocity 40 m s-1. The frequency heard by the passenger of the car Q is approximately [Take, velocity of sound =360 m s-1]

Choose an option

Show full solutionCorrect option: B
Correct answer
B471 Hz

Step-by-step explanation

Let velocity of sound in air be v m s-1. Using Doppler formula,

f=f0v+vov-vs=f0v+40v-20
=400360+40340
≈471 Hz

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About this question

This is a previous-year question from JEE Main 2023, 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.