# 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.
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## Doppler Effect for Mechanical Waves - Overview

by CK-12 //basic
Overview
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## Doppler Effect for EM Waves - Overview

by CK-12 //basic
Overview
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## Doppler Effect for Mechanical Waves - Example 3

by CK-12 //basic
Recognizing the apparent change in wavelength of a sound source moving away from an observer
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## Doppler Effect for Mechanical Waves - Example 4

by CK-12 //basic
Recognizing the apparent change in wavelength of a sound source moving towards an observer
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## Doppler Effect for Mechanical Waves - Example 5

by CK-12 //basic
Calculating the observed frequency for a sound source moving toward an observer using f = f[o]
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• Video

## Doppler Effect for Mechanical Waves - Example 6

by CK-12 //basic
Calculating the observed frequency for a sound source moving away from an observer using f = f[o]
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• Video

## Doppler Effect for EM Waves - Example 1

by CK-12 //basic
Recognizing the apparent change in frequency of a light source moving away from or towards an observer
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## Doppler Effect for EM Waves - Example 2

by CK-12 //basic
Recognizing the apparent change in wavelength of a light source moving away from or towards an observer
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## Doppler Effect for EM Waves - Example 3

by CK-12 //basic
Distinguishing between blue shifts and red shifts
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## Doppler Effect for Mechanical Waves - Example 1

by CK-12 //basic
Recognizing the apparent change in frequency of a sound source moving away from an observer
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• Video

## Doppler Effect for Mechanical Waves - Example 2

by CK-12 //basic
Recognizing the apparent change in frequency of a sound source moving towards an observer
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