Speed of sound in air rises with temperature because
AHot air has faster moving particles transferring energy quickly
BHot air has more molecules per cubic metre to carry sound
CHot air has more humidity than cold air does
DHot air has lower elasticity than the cool air
Answer & Solution
Correct answer: A. Hot air has faster moving particles transferring energy quickly
1. Speed depends on particle motion and elasticity.
2. Heating speeds up particles, increasing how fast they pass energy.
3. Density falls but speed still rises overall.
4. So option A is correct.
_Source: Selina Concise Physics Class 9, Ch 8 Sound (Mistral OCR'd PDF), section on factors of speed_
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