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How does the speed of sound in a gas change as the temperature of the gas increases?
AIt drops to zero
BIt decreases
CIt stays the same
DIt increases
Answer & Solution
Correct answer: D. It increases
1. Recall the factor relating sound speed and gas temperature.
2. Speed of sound in a gas is proportional to the square root of temperature: $v \propto \sqrt{T}$.
3. A higher temperature therefore gives a higher speed.
4. So the speed increases with temperature; it does not stay constant or fall to zero.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.68_
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