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Q.

What is the unit of loudness?


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a

Metre

b

Second

c

Aux

d

Decibel 

answer is D.

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Detailed Solution

The unit of loudness is Decibel.
Loudness is a characteristic of a sound wave that depends upon the amplitude. “It is expressed in terms of  Decibels (dB)”. It is said that a sound is loud if the amplitude of the sound wave is large. Also, it directly correlates with the square of the vibration's amplitude.
 
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