A man driving a car toward a large vertical wall sounds his
A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 92 km/h. The echo off the wall is heard by the man at a frequency of 791 Hz. What is the frequency of the car's horn?
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a man driving a car toward a large vertical wall sounds his horn the car is traveling at 92 kmh the echo off the wall
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