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

The intensity due to a number of independent sound sources is the sum of the individual intensities. (a) When five quintuplets cry simultaneously, how many decibels greater is the sound intensity level than when a single quintuplet 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?

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