3) (a) How fast and in what direction must galaxy A be moving if an absorp- tion line found at wavelength 550nm (green) for a stationary galaxy is shifted to 450 nm (blue) (a "blue-shift") for galaxy A? (b) How fast and in what direction is galaxy B moving if it shows the same line shifted to 700 nm (red) (a "red shift")?
3) (a) How fast and in what direction must galaxy A be moving if an absorp- tion line found at wavelength 550nm (green) for a stationary galaxy is shifted to 450 nm (blue) (a "blue-shift") for galaxy A? (b) How fast and in what direction is galaxy B moving if it shows the same line shifted to 700 nm (red) (a "red shift")?
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Transcribed Image Text:3) (a) How fast and in what direction must galaxy A be moving if an absorp-
tion line found at wavelength 550nm (green) for a stationary galaxy is shifted
to 450 nm (blue) (a "blue-shift") for galaxy A?
(b) How fast and in what direction is galaxy B moving if it shows the same line
shifted to 700 nm (red) (a "red shift")?
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