D, E AND F PLEASE(c) An electron is moving at a velocity 0.9c in a direction which is 30° from the x-axis in the direction of the y-axis. Write down the 4-velocity vector for theelectron.(d) Write down the momenergy vector of the electron described in the previoussection.(e) A spaceship travels towards the centre of a black hole. It sends regular lightpulses at a single frequency to an observer located far away from the black hole.Describe what the observer will see.(f) An isotropically emitting source of light is moving towards an observer at highspeed. Describe the source as seen by the observer.

“Since you have asked multiple question, we will solve the first question for you. If you want any…

(c) An electron is moving at a velocity 0.9c in a direction which is 30° from the x- axis in the direction of the y-axis. Write down the 4-velocity vector for the electron. (d) Write down the momenergy vector of the electron described in the previous section. (e) A spaceshin travels towards the centre of a black hole It sends regular light

(c) An electron is moving at a velocity 0.9c in a direction which is 30° from the x- axis in the direction of the y-axis. Write down the 4-velocity vector for the electron. (d) Write down the momenergy vector of the electron described in the previous section. (e) A spaceshin travels towards the centre of a black hole It sends regular light