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Radial Velocity from Doppler Shift
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Astronomy
AST.187 Radial Velocity from Doppler Shift
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An observing log reports a percent wavelength change. A stellar line is shifted by a 0.40% decrease in wavelength compared with its rest wavelength. Use c = 300,000 km/s. Which radial speed and direction are indicated?
A
about 10 km/s, moving toward Earth
B
about 1,200 km/s, moving toward Earth
C
about 120,000 km/s, moving away from Earth
D
about 1,200 km/s, moving away from Earth
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