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Suppose a star is moving toward you with a speed of 200 km/s. (a) Will its spectrum appear blueshifted or redshifted? (b) At what wavelength

Suppose a star is moving toward you with a speed of 200 km/s.

(a) Will its spectrum appear blueshifted or redshifted?

(b) At what wavelength will you observe the Hα (H-alpha) line (rest wavelength 6,563 A) in the star's spectrum?

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