JEE Main 2015PhysicsWaves and SoundEasyMCQ

JEE Main 2015 — Waves and Sound Question with Solution

JEE Main 2015 (10 Apr Online)

Question

A bat moving at 10 m s−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f. The value of f in Hz is close to
(speed of sound=320 m s−1)

Choose an option

Show full solutionCorrect option: D
Correct answer
D8516

Step-by-step explanation



We can assume that reflected wave is due to image of B coming with same speed in opposite direction

Observer

f= v+10v-10 ×f0

    = 320+10320-10 ×8000

    = 330310 ×8000

    = 3331 ×8000

    = 8516 Hz

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About this question

This is a previous-year question from JEE Main 2015, 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.