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An interstate highway has been built though a poor neighborhood in a city. In the afternoon,...

An interstate highway has been built though a poor neighborhood in a city. In the afternoon, the sound level in a rented room is 111.0 dB as 127 cars pass outside the window every minute.

(a) What is the sound intensity during the day ?

Late at night, the traffic flow is only 7 cars per minute.
(b) What is the ratio of the sound intensity between night and day (I at night / I during day)

(c) What is the sound intensity at night?

(d) What is the average late-night sound level?

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