Geography, 05.10.2019 04:30 keke6361

41. what is the velocity (speed and direction) relative to earth of a star with a spectral 1 normally seen at 625 nm that is now at 690 nm? (speed of light = 300,000 km/sec) a) 31,200 km/sec toward earth b) 31,200 km/sec away from earth c) 10.4 km/sec toward earth d) 10.4 km/sec away from earth

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