A police car siren emits a sound at 600 Hz. If an observer moves toward the source at 50 km/hr and hears a siren frequency of 678 Hz, calculate the speed of the police car and whether it is approaching or receding from the observer assume the speed of sound in air is 343 m/s) .
A) 99.0 km/hr receding
B) 144 km/hr approaching
C) 99.0 km/hr approaching
D) 144 km/hr receding
E) Not possible for any reasonable police car speed.
Correct Answer:
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