You are standing in the middle of a large room listening to a cacaphony of sound

Question

You are standing in the middle of a large room listening to a cacaphony of sounds. Rank the intensity level of the sounds from each source (1=loudest, 2= next loudest, ...) Consider all objects to be right next to you. (Remember that if you have a tie, you skip some ranks.)
1) Ten buzzers each producing a sound with intensity level of 62dB.
2)    One hundred buzzers each producing a sound with intensity level of 48dB.
3)    An object emitting a sound with an intensity of 70dB.
4)    Two buzzers each producing a sound with intensity level of 66dB.

Explanation / Answer

If noise sources are of equal power then

L_eq = 10*logn + L_1

n = number of sources

L_1 = intensity of each source

a) L_eq = 10*log10 + 62 = 72db

b) L_eq = 10*log100 + 48 = 68db

c) L_eq = 70db

d) L_eq = 10*log2 + 66 = 69db

1 - a)

2 - c)

3 - d)

4 - b)

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