Derive an expression relating the time interval measured by a clock in its rest frame and the time interval measured in a frame in which the clock is moving with velocity v (lorentz factor γ) 5 marks 4b) consider the radiation emitted by a quasar jet that is moving with a velocity u at an angle θ to the line of sight toward the earth. show that the observed apparent speed of a blob moving along the jet bapp in the plane of the sky (on the celestial sphere) is given by sin θ app where b is u/c. (4c) show that the maximum apparent speed is observed when the angle between the jet's motion and the line of sight toward the earth is given by cos - (4d) a blob in the jet of a quasar has been observed to move on the celestial sphere with an apparent angular speed of 3.2 x 104 arcseconds/year. the distance of the quasar is 1576 mpc. what is the value of bapp for this motion?