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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