JEE Main 2026 — Waves and Sound Question with Solution
JEE Main 2026 (23 January Shift 2)
Question
The velocity of sound in air is doubled when the temperature is raised from to . The value of is .
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Show full solutionCorrect answer: 819
Correct answer
819
Step-by-step explanation
The velocity of sound in air depends on temperature as (absolute temperature).
If the velocity doubles:
.
Squaring: .
With K and K:
, giving K.
Therefore .
If the velocity doubles:
.
Squaring: .
With K and K:
, giving K.
Therefore .
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This is a previous-year question from JEE Main 2026, 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.