*Doppler Effect Simulation written by Samuel Knutson, Dr. Melissa Hayes-Gehrke, and Dr. Alberto Bolatto in 2011-2012. We acknowledge support from a CAREER award by the National Science Foundation, grant AST-0955836, and from a Cottrell Scholar award by the Research Corporation for Science Advancement, grant 19968. We also thank Reiner "Tiles" Prokein for the cannon animation images, available at http://www.reinerstilesets.de/.*

- Running the Simulation
- Moving the Shooter and Target
- Changing the Target's Velocity
- Enabling/Disabling Sound
- Viewing Graph History
- Linking the Graphs

- Why won't the Applet load in my browser?
- The applet says sound is not working in my browser; what does this mean?
- What is plotted on the graphs?
- What is meant by the term "frequency"?
- How are the times on the graph related to the frequency of the cannon shooting and the frequency of the cannon balls hitting the target?
- How can I figure out the frequency of the cannon shooting or the ball hitting the target from the graphs?
- How does the frequency of the cannon shooting and the ball hitting the target change with motion?
- What is the general concept of the Doppler Effect?
- What do the terms "redshift" and "blueshift" mean?
- Shouldn't the blueshift get bigger and bigger as the target approaches the cannon?