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​A machine shop has 120 equally noisy machines that together produce an intensity level of 92...

​A machine shop has 120 equally noisy machines that together produce an intensity level of 92 dB. If the intensity level must be reduced to 82 dB, how many machines must be turned off?

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Answer #1

Find the number of machines required to be turn off using the equation for sound level in terms of intensity of sound as shown below

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