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A type of foam ear plug has a 26 dB overall EPA noise reduction rating. Sally...

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Physics

A type of foam ear plug has a 26 dB overall EPA noise reductionrating. Sally wants to sleep on her bus ride and decides to usethese earplugs. The noise level inside the bus is 87 dB.
(A) What noise level would she perceive with the ear plugs thathave the 26 dB noise reduction?
The reduced noise level would be _________ dB.
(B) A loud rock band produces a sound level of 117 dB at a locationnear the band. In a work environment, regulations limit exposure tothis very loud sound to 30 minutes or less per day. What is thesound intensity of the rock band?
Intensity is __________ W/m2.
(C) Using the ear plugs with 26 dB noise reduction, what soundlevel would she preceive?
She would preceive _________ dB sound level.
(D) What is the sound intensity she hears with the ear plugs?
Sound intensity, after attenuation by ear plugs, is ________W/m2

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