Mach is the unit of measurement in stating the speed of a moving object in relation to__________?
Correct answer: A. The speed of sound
- A. The speed of sound
- B. The speed of other object
- C. The speed of light
- D. The speed of air resistance
Explanation
Mach number is the ratio of an object's speed to the local speed of sound: Mach number = object speed (m/s) ÷ sound speed (m/s). The likely mistake is choosing the speed of light, which is relevant to relativistic motion but not to Mach number.
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About Speed of Sound
The speed of sound depends on the properties of the medium, including its elasticity and density, and in gases it varies mainly with temperature. Questions connect speed with frequency and wavelength, compare sound in solids, liquids and gases, and distinguish the speed of propagation from the oscillating particles' motion.
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