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September 2, 2014

September 2, 2014

Posted by **Mark** on Monday, November 16, 2009 at 11:01am.

- Physics-Astronomy -
**drwls**, Monday, November 16, 2009 at 11:47amIf the star moving away from earth, which is the usual case, the shift is towards the red.

You can use the formula

(delta lambda)/lambda = v/c = 0.002

'delta lambda' is the Doppler shift of wavelength, lambda. That is what they are asking for.

There is a more accurate relativistically correct formula that is the same whether the observer or the source is moving, but at this low v/c value, it gives nearly the same result.

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