Q.

Which of the following is the unit of perceived loudness of sound?

A. Decibel
B. Sone
C. Hertz
D. Phon
Answer» B. Sone
Explanation: Loudness is a subjective characteristic of a sound (as opposed to the sound-pressure level in decibels, which is objective and directly measurable). Perceived loudness of sound is a psycho-acoustic quantity that depends on sound pressure level, the frequency spectrum, and the time behavior of the sound in question.
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