# Doppler Effect

## Waves emitted from a moving source are perceived are perceived at a higher or lower frequency by a stationary observer.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Doppler Effect

Students will learn what the Doppler effect is and how to determine frequencies and speeds using the Doppler shift equations.
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## Doppler Shift

Explains the Doppler shift for sound.
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## Unit 11.4 Doppler Effect

Students will learn what the Doppler effect is and how to determine frequencies and speeds using the Doppler shift equations.
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• Interactive Simulations

## Doppler Ducks

Learn about the Doppler Effect in the context of a duck swimming across a pond.
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• PLIX

## Position Relative to Motion

Doppler Effect Interactive
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• Video

## Doppler Effect Asymmetry

An example is used to explain why the Doppler effect is different depending on if the source of the sound or the observer is moving.
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• Video

## Doppler Effect: Moving Source

Explains the Doppler effect, derives the formula for the effect, and solves an example problem. This video looks at the situation where the source is moving.
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• Video

## Doppler Effect: Moving Observer

The Doppler effect is explained for a moving observer and the formula for this situation is derived.
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• Critical Thinking

## Doppler Effect Discussion Questions

A list of student-submitted discussion questions for Doppler Effect.
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• Real World Application

## Echolocation

Learn how bats fly and hunt in the dark.
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• Real World Application

## Sonic Boom

Discover the cause of a sonic boom.
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• Study Guide