MIAT Physics Practice Test

What is the speed of sound at standard sea level?

343 m/s 1125 ft/s 768 mph 661.7 knots

Correct Answer:

661.7 knots

Explanation:

Sound travels through air at a speed set by temperature. At standard sea level conditions (about 20°C), that speed is about 343 meters per second. To compare in nautical terms, convert meters per second to knots: 1 m/s is about 1.9438 knots, so 343 m/s is roughly 666–667 knots. The option 661.7 knots is the closest match to that value, which is why it represents the speed of sound at standard sea level. The same speed is also about 767 mph or roughly 1125 ft/s.

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