A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
A) 0
B) 15
C) 29
D) 63
E) 250

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The Answer of A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
A) 0
B) 15
C) 29
D) 63
E) 250

A Fire Engine Approaches a Wall at 5 M/s While