Answer to Question #99740 in Mechanics | Relativity for AbdulRehman

Question

Let’s get one more perspective on the twin paradox. It is always interesting
to ask what each twin sees during the trip. Now, note that what you
actually see has to do with light rays, and with when a bit of light happens
to reach your eye. So, to study this question, we should study light rays
sent from one twin to the other. We will again have Gaston go off to
Alpha Centauri (4 light-years away) and back at .8c while Alphonse stays
at home.
(a) Let’s first think about what Gaston (the traveling twin) sees. Start
by drawing a spacetime diagram for the trip in any inertial frame (itis easiest to use Alphonse’s frame of reference). Now, suppose that
Alphonse emits one light ray every year (according to his own proper
time). Draw these light rays on the diagram. How many of these
light rays does Gaston see on his way out?

Answer 1

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