You need to log in to create posts and topics.

Magnitude & Distance

Consider a star in a distance of 10 pc from the Earth which moves with a speed v in the direction away from an observer on the Earth who found that it has a redshift of z = 0.1 Now Find the time period t over which the star will have to continue receding from the Earth in order for it's magnitude to increase by ∆m = 0.1 mag