6) The redshift of a galaxy is observed to be 1.5. Calculate the recessional velocity of the galaxy.
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- Redshift takes place when the source is moving away from the observer. This reduces the frequency which will in turn increase the wavelength shifting the spectrum to the red side.
- The velocity at which the source is moving away from the observer will be given by,
Here v is the recessional velocity, c is the speed of light, and z is the redshift.
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