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Q.

[15]

What determines the loudness?


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a

Amplitude of sound wave

b

Amplitude of radio wave

c

Frequency of sound wave

d

Frequency of radio wave 

answer is A.

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Detailed Solution

Amplitude of sound wave determines the loudness.
The amplitude of a wave is the maximum depth of a tough or maximum height of a crest in a wave. It is the distance from the centre line to the top of the crest or the bottom of a trough. The loudness of the sound is directly proportional to the square of the amplitude. If a sound wave's amplitude is higher, the sound will be louder. Loudness depends on intensity as well as the sensitivity of the ear. The unit of loudness is decibel.
 
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[15]What determines the loudness?