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Without a microphone, a certain singer in the concert hall produces 67 dB. With a microphone, this increases to 83.5 dB. a) The sound intensity

Without a microphone, a certain singer in the concert hall produces 67 dB. With a microphone, this increases to 83.5 dB.

a) The sound intensity with the microphone is how many times the previous (unmiked) intensity? Round your answer to the nearest 0.1.

b) How many times as loud does the singer sound to the audience when using a microphone compared to without one?

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