Question

How are loudness and amplitude related

Answer 1

Loudness is determined by the amplitude of sound waves i.e. sound waves with higher amplitudes are louder.
All type of waves have amplitude but amplitude in sound waves is associated with loudness.
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Answer 2

The loudness of a sound is linked to the size of the vibration which produces it. A big vibration makes a louder sound. Scientists use the word 'amplitude' for the size of waves. For waves on water, it is easy to measure the amplitude.

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