A train is traveling east on the tracks at 50 mph (22.2 m/s) and blows its whist

Question

A train is traveling east on the tracks at 50 mph (22.2 m/s) and blows its whistle at a
frequency of 400 Hz. The speed of sound in air is 343 m/s. Assume all motions are along
parallel straight lines and neglect the lateral spacing of the streets and railway line.

1. [Use 4 significant figures]

(a) A pedestrian is waiting at Main Street to cross the tracks. What is the whistle
frequency heard by the pedestrian?
(b) A bicyclist is riding east on State Street at 3.00 m/s. What is the whistle
frequency heard by the bicyclist?
(c) The person in the car is driving west at 13.0 m/s. What is the whistle frequency
heard by the motorist?

2. Suppose the pedestrian hears the echo of the sound reflected off the moving car, what
frequency is observed?

Explanation / Answer

we can use the doppler effect to solve the following ques....

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