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Q.

The loudness of sound is measured in which of the following units?

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a

Centimeter

b

Joule

c

Decibel

d

Newton 

answer is C.

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Detailed Solution

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The loudness of sound is measured in decibels. 
The sound amplitude is the maximum height of the sound wave above the axis. Therefore, amplitude determines the loudness of the sound. 

Decibel(dB) is the unit of loudness. We know that loudness is directly proportional to the square of the amplitude of the sound. So, if the amplitude of the sound wave is large, the sound is loud. 
 

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