Q36 · Practice questionComplex familiar1 mark
QUESTION 36
In the twins’ paradox, the travelling twin can return younger than the stay-at-home twin because
(A)
time dilation is an optical illusion
(B)
the twins follow different spacetime paths and the travelling twin changes inertial frames
(C)
the stay-at-home twin moves faster than light
(D)
proper time is always greatest for the accelerating observer
WORKED SOLUTION
1 markAnswer B
ANSWER
B
Worked solution
The twins’ situations are not symmetric over the full journey: the traveller turns around and changes inertial frames, so the elapsed proper times along the two worldlines differ.
Select the correct option.
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