This explanation of the Doppler effect allows students to visualize how this physics phenomenon happens.

At this tutorial, a happy bug in the center of a circular water puddle is used to describe the Doppler effect.

Read a passage about the doppler effect in living tissue and answer the follow-up questions.

Colorful PBS site explores the Doppler Effect and the reading of absorption lines.

This site has information about weather radar and the types of information which can be retrieved from Doppler radar. Consists of a three-part student activity; easily adaptable to any student project.