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The Doppler Effect
Grade Level
Astronomy
AST.072 The Doppler Effect
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Which information is most useful for deciding whether a spectral line is redshifted or blueshifted?
A
Only the distance from the line to the edge of the printed page.
B
Only the apparent brightness of the source.
C
The line's rest wavelength and its observed wavelength.
D
The telescope's color and the star's name.
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