If a large housefly 3.0 m away from you makes a noise of 40.0 dB, what is the noise level of 1000 flies at that distance, assuming interference has a negligible effect?
If a source is emitting sound of some intensity then n number of sources emitting sound of same intensity will definitely cause increase in sound intensity and intensity emitted by identical sources will be times of the single source if interference is not considered.
The expression to find the intensity level of sound is,
= (10 d) ()
Here is intensity level of sound, is intensity of sound and is reference intensity of sound.
Substitute, 40 dB for and w/ for in the expression of intensity level of sound,
40 dB = (10 dB) ()