An automobile horn is heard at 1200 Hz while the car approaches a stationary observer…

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

An automobile horn is heard at 1200 Hz while the car approaches a stationary observer and at 800 Hz after it passes. The speed of sound in air is 340 m/s. Determine (a) the horn’s rest frequency and (b) the speed of the automobile.

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