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What speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589. 6nm?

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306 km/s

306 km/min

306 km/h

306 m/s

answer is A.

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Detailed Solution

$\begin{array}{l} \frac{Δλ}{λ} = \frac{V_{s}}{C}; \frac{0 .6}{589} = \frac{V_{s}}{3 \times 10^{8}} \\ V_{s} = \frac{18 \times 10^{7}}{589} = 306 km / \sec \end{array}$

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