A giant chorus of 1000 vocalists is singing the same note. Suddenly, 999 vocalists stop, leaving one soloist. By how many decibels does the sound intensity level decrease? Explain.

The decrease in decibels is 0.1 dB.

Explanation:

Let the intensity of one chorus is Io.

let the intensity of 1000 vocalist is dB.

The intensity of 1000 vocalist is 1000 Io.

..... (1)

let the intensity of 999 vocalist is dB'.

..... (2)

So, the change is

= dB - dB' = 30 - 29.9 = 0.1 dB

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