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Suppose we observe an object that is 10 Mpc away. At what wavelength is the H...

Suppose we observe an object that is 10 Mpc away. At what wavelength is the H line observed if (a) the object has no other motion, (b) the object has an additional motion away from us at 1000 km/s, (c) the object has an additional motion towards us at 1000 km/s.

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