Name the unit in which the laudness or the sound is expressed.

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Solution

A sound unit is any acoustic unit of sound measurement $d B,$ decibel $-$ noise of sound measurement is called decibels $d B .$ Ratio of the sound pressure to reference pressure to something $.$ sone $-$ a unit of perceived loudness equal to the loudness of a $1000 -$ hertz tone at $40 d B$ above threshold $,$ starting with $1$ sound $.$

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