Waves and Sounds

Free Version

Upgrade subject to access all content


Doppler Effect: Moving Source


You are waiting at a train crossing when a train passes through at $50\:m/s$. As it goes through the crossing, the train steadily blows its $440\:Hz$ whistle, such that you hear the whistle both as the train is approaching and also as it is receding. The speed of sound is $340\:m/s$.