I don’t even know where to start with this problem: A mad doctor believes that baldness can be cured by warming the scalp with sound waves .

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I don’t even know where to start with this problem:

A mad doctor believes that baldness can be cured by warming the scalp with sound waves. His patients sit underneath the Bald-o-Matic loudspeakers, where their heads are bathed with 91dB of soothing 800Hz sound waves. Suppose we model a bald head as a 16-diameter hemisphere. If 0.23 of sound energy is considered an appropriate “dose,” how many minutes should each therapy session last? Answer time in minutes

 

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