A sound source is moving toward a microphone: Pulses, sound frequency
A sound source is moving toward a microphone at 25 m/s, emitting sound at a constant frequency of 740 Hz (i.e. 740 pulses per second). If the source starts out 5 meters from the microphone then:
-how many pulses are emitted as the source approaches the microphone?
-how long is it between the instant the microphone receives the first pulse and the last?
-what sound frequency is therefore received by the microphone?
Assume sound travels at 340 m/s.