5. Which of the following statements is true about the speed of sound?
A. Sound travels faster in dry air than in wet air.
B. Molecules move faster so sound travels faster in warmer air.
C. Sound travels at a constant speed even if air temperature changes.
D. When comparing two media with the same phase, the sound will travel
faster in a denser material.
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Answer:
C sound travels
Explanation:
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C, the speed of sound in air is about 343 metres per second, or a kilometre in 2.9 s or a mile in 4.7 s