A car sounding its horn rated by the manufacturer at 600 hz, Ask an Expert

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A car sounding its horn (rated by the manufacturer at 600 Hz) is moving at 20 m/s toward the east. A stationary observer is standing due east of the oncoming car.

A) What frequency will he hear the assuming that the speed of sound is 343 m/s?

B) What if the observer is standing due west of the car as it drives away?

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