Here are a few sample questions about decibels, etc. Answers can be found here.

1.) Suppose one musician produces sound of 68 dB, and another produces sound of 74 dB.. If both musicians are playing, what is the sound intensity level?

2.) When the sound intensity level increases by 25 dB, what has happened to the intensity?

3.) When the intensity increases by a factor of 1000, the SIL increases by 30 dB. By how much does the SIL increase if the intensity increases by a factor of 2500?

4.) In one of the homework problems we are told that a trombone emits sound of 130 times the intensity of the sound emitted by a clarinet. Suppose two clarinetists are playing, and are then joined by a trombonist. By how much does the SIL increase when the trombonist joins in?

5.) If one musician produces an SIL of 75 dB, how many such musicians will produce an SIL of 90 dB?