Question

The difference between the speed of sound n air at 0°C and the speed of sound in air at 20°c is that... A. Cooler air molecules move more slowly and respond less readily to the energy of a sound wave. B. Cooler air molecules move more quickly and respond less readily to the energy of a sound wave. C. Cooler air molecules do not move and respond less readily to the energy of a sound wave. D. Cooler air molecules move more randomly and respond less readily to the energy of a sound wave.

Answer 1

Heat, like sound, is kinetic energy. Molecules at higher temperatures heave more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly.

So the answer is A.