lecture12spring2009 - Astronomy100Dr.Rhodes Lecture Chapter...

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Astronomy 100 - Dr. Rhodes Lecture #12 - 2/9/2009
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Chapter 4: Light and the Electromagnetic Spectrum The Doppler Effect The Doppler effect is the observed change in wavelength from a source moving toward or away from the observer. It is most well known as the change in pitch of sound waves when a speeding car or train that is blowing its horn passes by When the source is moving toward the observer, one hears (or sees) a higher frequency (shorter wavelength) wave.
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Chapter 4: Light and the Electromagnetic Spectrum The Doppler Effect Conversely, when the source is moving away from the observer, one hears (or sees) a lower frequency (i.e., longer wavelength) wave. Motion toward the observer results in what is called a blue shift . Motion away from the observer results in what is called a red shift .
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Chapter 4: Light and the Electromagnetic Spectrum The Doppler Effect The Doppler Effect is named for its discoverer, Christian Doppler (1805-53), an Austrian physicist and mathematician. Doppler explained the cause of this effect in 1842.
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Add outward pointing Arrows to the Circles to Represent the Outwardly Propagating Waves from Either a stationary (top) Or a moving (bottom) Wave Source
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QuickTimeª and a Video Format cvid decompressor are needed to see this picture.
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QuickTimeª and a Sorenson Video decompressor are needed to see this picture.
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Chapter 4: Light and the Electromagnetic Spectrum The Doppler Effect The same shifts occur whether it is the source or the observer, or both, who is moving. The Doppler Effect in Astronomy The Doppler Effect also works for EM waves. Light from object coming toward us has a wavelength shorter than normal.
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Comparison Laboratory Spectrum at the Top Red-shifted Stellar Spectum at the Bottom
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Chapter 4: Light and the Electromagnetic Spectrum The Doppler Effect Redshift is the change in wavelength toward longer wavelengths.
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