In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given point every minute. Late at night, the traffic flow is only 8 cars per minute. What is the late-night decibel level?

a. 77 dB
c. 70 dB
b. 74 dB
d. 69 dB


D

Physics & Space Science

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