A police car emitting a 700 Hz siren travels directly toward a vertical cliff face at…

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

Problem

A police car emitting a 700 Hz siren travels directly toward a vertical cliff face at 20 m/s. After reflecting from the cliff, the sound returns to the driver in the car. The speed of sound is 343 m/s. Calculate the frequency of the echo that the driver hears.

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