Question
Please explain
You are on a train moving at velocity v towards a train station. The velocity of sound in air is z. The station blows a whistle at some frequency, f. As you approach, you hear it at frequency g as you approach and at frequency h as you leave. What is the equation to determine the velocity v of the train? You can only use the variables g, h, and z. Your final answer must not include the frequency of the whistle. Doppler Shift A train is approaching you. Its speed is 50 meters per second. If its whistle emits sound at 2000 Hz, what are the frequencies you hear as it approaches you and then moves away?
Explanation / Answer
2) f' = Vf/(V-Vs) = (330*2000)/(330-50) = 2357.1 Hz...approaching
f' = Vf/(V+Vs) = (330*2000)/(330+50) = 1736.8 Hz...leaving