Discussion
At, the constant temperature (25°C), for which of the following substance the speed of the sound is maximum ?
Answer: B
Sound travels fastest in brass.
Sound travels faster in solids than in liquids, and faster in liquids than in gases, because the particles are more tightly bound. At 25°C sound moves at about 4,700 m/s in brass, about 1,200 m/s in ethanol, about 346 m/s in air and about 316 m/s in oxygen.
Brass is the only solid among the options, so the speed is greatest in it.
The general rule is that sound travels faster where the medium is more rigid, which is why solids carry sound fastest.
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