(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
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Transcribed Image Text: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 the
electron.
(d) Write down the momenergy vector of the electron described in the previous
section.
(e) A spaceship travels towards the centre of a black hole. It sends regular light
pulses 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 high
speed. Describe the source as seen by the observer.
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