Ripple Tank - Moving Source

This pair of videos of waves in a ripple tank can be used to demonstrate the Doppler Effect. One video,, shows ripples from a stationary source that students can analyze to find the frequency and wavelength of the waves. Another video,, shows the source moving at a constant velocity through the water. It may be used in class along with a movie of a moving sound source.

The movies were made using a Pasco ripple tank. A small 650W incandescent light source was mounted about one meter above the tank, and the ripples projected on the screen were photographed from the side (see lower picture on the right) using a high-speed video camera.


To download a movie, right-click on the link and choose "Save Link as...":

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This material is based in part upon work supported by National Science Foundation (NSF) grants 0089380, 0424063, 0717699 and 1122828. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.