Answer in one word-
The intensity of a vibrating source producing sound.

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Solution

Loudness of a sound is defined as the measure of the intensity of a wave.
Intensity refers to the energy carried by the wave (by the sound).
Loudness is directly proportional to the square of the amplitude of a sound wave-
$L α A^{2}$ ; where L is Loudness and A is amplitude.
Final Answer- Thus, The intensity of a vibrating source that produces sound is Loudness.

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Answer in one word-The intensity of a vibrating source producing sound.

Answer in one word-
The intensity of a vibrating source producing sound.