JEE Main 2020 — Waves and Sound Question with Solution
JEE Main 2020 (06 Sep Shift 1)
Question
A sound source S is moving along a straight track with speed , and is emitting sound of frequency .An observer is standing at a finite distance, at the point from the track. The time variation of frequency heard by observer is best represented by : (to represents the instant when the distance between the source and observer is minimum)
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Observed frequency will be
Using this formula we can say that observed frequency will decrease continuously and it becomes equal to original frequency when . So correct graph is
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This is a previous-year question from JEE Main 2020, 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.