-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.© BrainMass Inc. brainmass.com September 22, 2018, 2:42 pm ad1c9bdddf - https://brainmass.com/physics/sound-hearing/sound-source-moving-toward-microphone-pulses-45481
5/25=0.2 (s)........time required for pulses to arrive at the microphone
With explanations and calculations, the problems are solved.