Khan Academy: Waves and Optics:doppler Effect Formula When Source Is Moving Away

Young scientists observe the spectra of elements and compare that to the Doppler effect. Hook scholars from the beginning all the way to the extension activities in this 5E-format lesson. 

Here comes the sound. After watching a couple videos demonstrating and explaining the Doppler Effect, learners develop their own understanding of the phenomenon. Scholars draw a sound wave and observe how the perception of the wave...

In 1842, Christian Doppler proposed a theory relating the change of wavelengths based on motion. Young scholars observe the Doppler Effect on a small scale in a ball, on a larger scale from a car, and on the largest scale studying the...

Discover waves and optics by learning about the Doppler effect formula for observed frequency. [10:13]

Do you know why a siren has a high-pitched sound as it moves towards you but when it moves away it has a low-pitch sound? In this video learn about how the Doppler Effect causes this perceived change in the pitch of a sound. [10:36]

Now this is a very good demonstration of the Doppler Effect and how it works. A police car with its siren blazing is filmed as it travels closer and then farther away. The effect is explained through text and an illustration. Good video.

The history of our understanding of the center of the universe is explored through this film. The ideas of Aristotle, Copernicus, Bruno, Descartes, and Herschel are included, as well as the new discoveries that have helped the theories...

Learn about waves and optics by discovering this example of Snell's Law. [10:44]

Explore waves and optics with details of object image and focal distance relationship (proof of formula). [12:29]

Discover waves and optics by learning about refraction in water. [4:25]