JEE Main 2016PhysicsWaves and SoundEasyMCQ

JEE Main 2016 — Waves and Sound Question with Solution

JEE Main 2016 (09 Apr Online)

Question

Two engines pass each other moving in opposite directions with uniform speed of 30 m/s. one of them is blowing a whistle of frequency 540 Hz. Calculate the frequency heard by driver of second engine before they pass each other. speed of sound is 330 m/sec:

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Show full solutionCorrect option: D
Correct answer
D648 Hz

Step-by-step explanation

From Doppler's effect of sound, apparent frequency is given by, 
f′=v+v0v-vsf, where v, vo, vs&f represents velocity of sound, velocity of observer, velocity of source and frequency of source repectively.
=330+30330-30×540
=360300×540
=648 Hz

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About this question

This is a previous-year question from JEE Main 2016, 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.