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[4 pts.] By what factor must the intensity of a sound be increased to raise its...

[4 pts.] By what factor must the intensity of a sound be increased to raise its loudness (i.e., its sound level) from 10 dB to 20 dB? From 20 dB to 30 dB? 0 dB to 10 dB?(b) [10 pts.] How much closer to a sound source must you stand to make the intensity your ear receives 20 times bigger? To increase its loudness by 20 dB?

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