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  An object emitting a sound with an intensity level of 10dB.
1 2 3 4  An object emitting a sound with an intensity level of 60 dB.
1 2 3 4  Two buzzers each producing a sound with intensity level of 50 dB.
1 2 3 4  An object emitting a sound with an intensity of 1.0×10-9 W/m2.

Explanation / Answer

4. An object emitting a sound with an intensity level of 10 dB.
1*10dB = 10 dB

1. An object emitting a sound with an intensity level of 60 dB.
1*60dB = 60 dB

2. Two buzzers each producing a sound with intensity level of 50 dB.
2*50dB = 50+10log2 = 50+3 = 53 dB

3. An object emitting a sound with an intensity of 1.0×10-9 W/m^2. The reference level is 10^-12W/m^2

= 10dB*log(I/I0) = 10dB*log(1.0x10-9/10-12) = 30dB

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