Posted by **Amanda** on Saturday, March 29, 2008 at 5:25pm.

The intensity due to a number of indipendent sound sources is the sum of the individual intensities.

A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries?

B) To increase the sound intensity level again by the same number of decibels as in part a), how many more crying babies are required?

- Physics -
**drwls**, Saturday, March 29, 2008 at 6:15pm
(A_ Four babies have 4 times the intensity (sound power) as one baby. The decibel formula tells you the difference is 10 Log 4 = 6.02 dB.

(B) It will take another factor of four times as many babies (16 in all) to raise the sound level by another 6.02 dB.

- Physics -
**Amanda**, Saturday, March 29, 2008 at 7:42pm
Thanks alot. I had the right formula, i just didn't have I. Thanks again

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