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) Two buzzers each producing a sound with intensity level of 90 dB.
(1 2 3 4) An object emitting a sound with an intensity of 1.0×10-9 W/m2.
(1 2 3 4) An object emitting a sound with an intensity level of 100 dB.
( 1 2 3 4) An object emitting a sound with an intensity level of 110 dB.

Explanation / Answer

dB = 10log I/Io; where I = given intensity and Io = constant (1*10^-12 W/m^2).

intensity of 1.0×10-9 W/m2. db =10log(1.0×10-9 /1*10^-12 ) =30db

1- An object emitting a sound with an intensity level of 110 dB.

2- An object emitting a sound with an intensity level of 100 dB.

3- Two buzzers each producing a sound with intensity level of 90 dB.

4-An object emitting a sound with an intensity of 1.0×10-9 W/m2.

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