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The instrument used to measure the ratio between aircraft speed and the speed of sound is the __________________?

A) Anemometer
B) Altimeter
C) Machmeter
D) Speedometer

Correct Answer: C) Machmeter

Reason: A Machmeter measures the ratio of true airspeed to the speed of sound (Mach number).
Related One-Liners:
1) Mach 1 is the speed of sound; Supersonic is above Mach 1.
2) The speed of sound is approx 343 m/s in dry air.
3) Measures wind speed. Anemometer.
4) Measures atmospheric pressure. Barometer.

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