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Vega, a star is located in the constellation Lyra, has a H alpha emission line measured...

Vega, a star is located in the constellation Lyra, has a H alpha emission line measured at wavelength observed os 656.240nm. Given that H alpha emission has a resting measurement of wavelength 656.280nm, What is Vega's radial velocity, Vradical, to three significant figures in unites of m/s? is it moving toward us or away from us? C=300,000km/s

v=c wavelength observed over= C is 300,000km/s
wavelength resting point

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