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Amplitude is measured in metres for a mass on a spring, but for sound oscillations it is measured in units of:

ADistance
BDuration
CPressure
DLoudness
Answer & Solution
Correct answer: C. Pressure
1. Amplitude means the maximum departure from equilibrium, whatever is oscillating. 2. For the object on the spring, the units of amplitude and displacement are metres. 3. For sound oscillations they have units of pressure. 4. Other types of oscillation have yet other units again. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 16 'Oscillatory Motion and Waves', sections 16.1-16.11_
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