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What spped should a galaxy move with respect to us so that the sodim line at 589.0nm is observed at 589.6nm?

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Since `vlamda=c, (Deltav)/(v)=(Deltalambda)/lambda` (for small changes in v and `lambda)`.For `Deltalamda=589.6-589.0=+0.6nm`
we get `["using Equation "(Deltav)/(v)=(upsilon_("radical"))/(c)]`
`or, upsilon_("radical")approx +c ((0.6)/(589.0))=+3.06xx10^(5)m s^(-1)`
=306 km/s
Therefore, the galaxy is moving away from us

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