, 21.06.2019 23:30, larissa1013

# The h line in calcium is normally at 396.9 nm. however, in a star's spectrum, it is measured at 398.1nm. how fast is the star moving and is it moving towards the earth or away from the earth? 1- 904.3 km/s away from the earth 2- 904.3 km/s towards the earth 3- 907.0 km/s towards the earth 4- 907.0 km/s away from the earth

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