Question: 7 . A listener doubles his distance from a source that emits sound uniformly in all directions. There are no reflections. By how many decibels

7. A listener doubles his distance from a source that emits sound uniformly in all directions.
There are no reflections. By how many decibels does the sound intensity level change?
8. Two trucks travel at the same speed. They are far apart on adjacent lanes and approach each
other essentially head-on. One driver hears the horn of the other truck at a frequency that is 1.14
times the frequency he hears when the trucks are stationary. The speed of sound is . At
what speed is each truck moving?

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