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A galaxy moving with speed 300km/s shows...

A galaxy moving with speed 300km/s shows blue shift. At what wavelength sodium line at 589.0 nm will be observed ?

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To find the observed wavelength of the sodium line at 589.0 nm when a galaxy is moving towards us with a speed of 300 km/s (indicating a blue shift), we can follow these steps: ### Step 1: Understand the Blue Shift A blue shift occurs when an object is moving towards the observer, causing the wavelengths of light to decrease. This is described by the formula: \[ \frac{\Delta \lambda}{\lambda} = \frac{V_{\text{radial}}}{c} \] ...
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