the car is overtaking the truck
the relative speed is 30 mph
... the distance is closing
... that's why the Doppler frequency is higher
apparent frequency = actual frequency * [(speed of sound) / (speed of sound - closing speed)]
A truck is moving away at 30 mph from a car moving towards the truck at 60 mph. If
the truck emits a horn of frequency 500 Hz, what frequency does the driver of the car hear to 3
significant digits?
how do i solve i know the answer is 519hz but how?
1 answer
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