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Perception of Sound

The loudness ...

Question

The loudness of a sound is 8 db when the amplitude of vibrations is 2 units. If the amplitude is increased to 8 units, find the loudness of the sound in db. [3 MARKS]

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Solution

Each point: 1 Mark

1. Loudness α Amplitude²
2. Here amplitude increased 4 times. So, loudness should increase 16 times.
3. Therefore, Loudness= 16 x 8 = 128db

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Q. Question 5
In order to reduce the loudness of a sound we have to

(a) Decrease its frequency of vibration of the sound.
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(d) Increase its amplitude of vibration of the sound.

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