Posted by Amanda on .
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,
(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,
Thanks alot. I had the right formula, i just didn't have I. Thanks again