If a twin goes on a trip in a high-speed rocket ship,when she returns home she will be younger than her twin sister who did not go on the trip because of
A)time dilation.
B)length contraction.
C)the equivalence of mass and energy.
D)the principle of relativity.
E)none of the above.

Question

Quizplus · Accepted Answer

Time dilation is a phenomenon predicted by the theory of relativity, which states that time passes more slowly in a moving frame of reference relative to a stationary frame of reference. In this case, the twin who travels in the high-speed rocket ship experiences time dilation, and as a result, she ages more slowly than her twin sister who remained at home. Therefore, when the traveling twin returns home, she will be younger than her sister who did not go on the trip.

If a Twin Goes on a Trip in a High-Speed