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Q.

What determined the loudness of a sound?

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a

Amplitude of vibration

b

The ratio of amplitude and frequency of vibration

c

Frequency of vibration

d

None of these

answer is A.

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Detailed Solution

The loudness of a sound is determined by amplitude of vibration.
The maximum displacement of a vibrating body from its mean position is termed the amplitude of the sound. Amplitude decides the strength of sound. The amplitude of the sound waves is measured in decibels. The relation between loudness and amplitude is

loudness \propto (Amplitude)^{2}

. Suppose the amplitude of the wave is

2

. Then the sound's loudness will be increased by factor

4

. Therefore, if the amplitude is high, then the loudness of the sound is more.

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