This quantity counts complete wave cycles per second.

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Frequency measures how many cycles occur in a unit of time. Source: Frequency ↗

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37This quantity is the time taken for one complete wave cycle.RECALL
Period
It is the reciprocal of frequency
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38This wave measurement is the maximum displacement from the equilibrium position.RECALL
Amplitude
It relates to wave energy
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39Longitudinal wave · particle vibration direction relative to wave travelRECALL
Parallel to the wave's direction
Sound in air is longitudinal
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