Q.

Among the following materials sound travels fastest in –

A. Steel
B. Air
C. Vacuum
D. Water
Answer» A. Steel
Explanation: The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at 20 °C (68 °F), the speed of sound is 343.2 metres per second (1,126 ft/s). the speed of sound varies from substance to substance. Sound travels faster in liquids and non-porous solids than it does in air.
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