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Published byCuthbert Parrish Modified over 9 years ago
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The Doppler Effect
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Shown by all types of waves
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Properties of Waves Waves are characterized by two numbers: Wavelength, (size of the wave) Frequency, ν (number of waves/second) For sound waves, frequency more commonly called pitch For light waves, these are all related by: c = ν Where c is the speed of light Longer means Smaller ν
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Electromagnetic Wave Magnetic Field Electric Field
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The Doppler Effect Shift in the observed wavelength when the source is moving relative to the observer. Examples: Sound Waves (Siren or Train Horn) Light Waves Amount of the shift and its sign depends on relative speed of the source & observer direction (towards or away)
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Stationary Source Same Pitch
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Doppler Effect in Sound High Pitch (short waves) Low Pitch (long waves)
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The Doppler Effect in Light Works same as it does for sound Light moving away from the observer Wavelength gets longer: REDSHIFT Light moving towards the observer Wavelength gets shorter: BLUESHIFT
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Way to Measure Speeds Observe the wavelength ( obs ) of a source with a known emitted wavelength ( em ) The difference is directly proportional to the speed of the source, v: obs em v c - = em
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Use on Earth
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