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What speed should a galaxy move with res...

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

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To find the speed at which a galaxy should move with respect to us so that the sodium line at 589.0 nm is observed at 589.6 nm, we can use the Doppler effect for light. Here’s a step-by-step solution: ### Step 1: Identify the given values We know: - Original wavelength (λ) = 589.0 nm - Observed wavelength (λ') = 589.6 nm ### Step 2: Calculate the change in wavelength (Δλ) ...
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