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change in frequency because of motion: a perceived change in the frequency of a wave as the distance between the source and the observer changes
The state of a system in which an abnormally large vibration is produced in response to an external stimulus, occurring when the frequency of the stimulus is the same, or nearly the same, as the natural vibration frequency of the system.
speed = distance/time
1.
the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone
1.change in frequency because of motion: a perceived change in the frequency of a wave as the distance between the source and the observer changes