1. The problem statement, all variables and given/known data Radiation beaming (cone) from an object travelling towards you at some velocity 'v' with the observed flux enhanced by an amplification factor 'a'. Derive an equation for the velocity 'v' needed to produce an amplification factor 'a'. Thank you 2. Relevant equations Beaming angle = Theta (rad) = SQRT(1-(v/c)^2) v=velocity c= speed of light Amplification factor = a=4/Theta (rad)^2 3. The attempt at a solution From previous attempts z (red-shift) and Theta (beaming angle) are not in the derived equation.