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A 60 year old Iperson has a threshold of hearing of 87.0 dB for a sound with frequency f=10,000 Hz. By what factor must the

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A 60 year old Iperson has a threshold of hearing of 87.0 dB for a sound with frequency f=10,000 Hz. By what factor must the intensity of a sound wave of that frequency, audible to a typical young adult, (sound eve1=43.0 dB) be increased so that it is heard by the older person

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