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Physics, 25.12.2021 20:40 Squara

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

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The H line in Calcium is normally at 396.9 nm. However, in a star's spectrum it is measured at 398.1...
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