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.