Doppler Vista

DopplerVista

A family corner of the web for practice tests, projects, and things we’re curious about.

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Behind: redder Ahead: bluer
A moving source crowds its waves together in front and spreads them out behind. Crowded light looks bluer and spread-out light looks redder. That shift is the Doppler effect.

Practice tests

Pick a test and type your name to start. If an answer is wrong, you’ll get a hint and can try again.

  • Unit 3 test

    Adding and subtracting up to 1,000. 15 questions.

    Start test

New tests show up here as they’re added.