If a galaxy moving away from the Earth has a speed of 1000 km/s and emits 656
Question:
If a galaxy moving away from the Earth has a speed of 1000 km/s and emits 656 nm light characteristic of hydrogen (the most common element in the universe).
(a) What wavelength would we observe on the Earth?
(b) What type of electromagnetic radiation is this?
(c) Why is the speed of the Earth in its orbit negligible here?
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