# Homework Help: Need help with coming up with reasons as to why you would not hear the Doppler Effect

1. Apr 25, 2010

### crosbykins

1. The problem statement, all variables and given/known data

-You are traveling in a car near a speeding train. The train whistle blows but you fail to hear the doppler effect. What conditions might prevent you from hearing it?

2. Relevant equations

3. The attempt at a solution
-Ok, all I can come up with is that maybe the car and train are traveling at the same velocity, so there would be no doppler effect or maybe the train is travelling at a speed greater than mach 1. Are these correct reasons?? Please help, thanks in advance.

2. Apr 25, 2010

### Antiphon

Re: Need help with coming up with reasons as to why you would not hear the Doppler Ef

Your first guess is correct. Your second guess is wrong but freaking awsome- a supersonic train. I'd like to see the wheel and rail design of such a thing. Would a steel wheel rolling along at 1000 miles per hour even be able to hold together?