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The Doppler Effect
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Description
Most stars have a dark-line spectrum
Instrument used to spread out the light is called a spectroscope

Doppler effect
The apparent change in wavelength of radiation caused by the relative motions of the source and observer
Used to determine
Direction of motion
Increasing distance – wavelength is longer (“stretches”)
Decreasing distance – makes wavelength shorter (“compresses”)
Velocity – larger Doppler shifts indicate higher velocities

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