Q. 20

If the intensity of sound is doubled, by how many decibels does the sound level increase?

Answer :

Let the intensity of the sound be and be the sound level. If the intensity of the sound is doubled, then its sound level becomes.

Sound level is given by:

Where, = the constant reference intensity

When the intensity doubles, the sound level is given by:

According to the question,

The sound level is increased by 3 dB.

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