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5. A galaxy emits light with a frequency of 5.45 1014 Hz. (a) What color is this, approximately? (b) We observe this galaxy at

5. A galaxy emits light with a frequency of 5.45 1014 Hz. (a) What color is this, approximately? (b) We observe this galaxy at a wavelength of 520 nm. How fast is it moving away from us?

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