Test: GRE Subject Test: Physics

1.

At one point in time, two twins are 30 years old.  At this time, one of them gets on a rocket and travels at 0.8 c, for what he experiences to be 12 years.  How old is the twin that remained on Earth when the traveling twin returns home?

70 years old

50 years old

42 years old

37 years old

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