Jose and Josie are twins. Suppose Josie takes a ride in a spaceship to a distant star some 4 light-years distant, traveling at a constant speed of 0.8c. After arriving at the star Josie quickly turns around and immediately comes back at the same speed.
(a) How much older is Jose when Josie returns?
(b) How much older is Josie when she returns?
Any help is appreciated!
Physics (Urgent!!!!)
2007-05-11 2:00 pm
回答 (1)
2007-05-11 5:45 pm
✔ 最佳答案
(a) Since Jose doesn't travel, in her point of view, Josie takes 4c / 0.8c = 5 years to reach the distant star and uses the same amount of time in her return journey. Therefore, Jose will be 5 X 2 = 10 years older when Josie returns.(b) Since Josie travels at 0.8c, relativity effect takes place, by Lorentz transformation, her clock will run 1 / √(1 - 0.8²) = 1/0.6 times slower than Jose's, therefore she is only 10 X 0.6 = 6 years older when she returns.
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