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 of the sounds from each source (1=loudest, 2= next loudest, ...) Consider all objects to be right next to you. If two values are within 0.1 dB from each other, consider them to be the same.
1 2 3 4 5  An object emitting a sound with an intensity level of 60 dB.
1 2 3 4 5  100 buzzers each producing a sound with intensity level of 30 dB.
1 2 3 4 5  An object emitting a sound with an intensity level of 20dB.
1 2 3 4 5  Two buzzers each producing a sound with intensity level of 50 dB.
1 2 3 4 5  An object emitting a sound with an intensity of 1.0×10-9 W/m2.

Explanation / Answer

1 decibel is defined as
L = 10 log(P/Po)
where Po = 10^-12

so, Po = 10^-9
so L = 10 log(10^3) = 30 dB

hecnem the ranking for the parts are

60 dB object -> 1
30 dB object -> 3
20 dB object -> 4
50 dB object -> 2
calculated power object -> 3

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