Lesson: The Doppler Effect
In this lesson, we will learn how to calculate the change in the frequency of waves that are emitted by a source that is moving relative to the observer.
Sample Question Videos
Worksheet: 17 Questions • 6 Videos
A hawk swoops down to catch a mouse, screeching as it does so. The hawk approaches the mouse at a speed of 25.0 m/s, and the frequency of the screech is Hz. What is the frequency of the screech as heard by the mouse? Use a value of 331 m/s for the speed of sound in air.
What is the speed of the train?
If the train’s speed remains constant, what frequency does the observer measure as the train recedes from them?
An ambulance with a siren blaring is approaching an accident scene. The ambulance is moving at 70.00 mph. A nurse is approaching the scene from the opposite direction, running at . What frequency does the nurse observe? Assume the speed of sound is .