本题目来源于试卷: Space Time & Motion A.5 Special Relativity，类别为 IB物理学
[单选题]
A spaceship is moving 4r(o,s4iw wt67s k 3m -lkwrbk.;f-b- gqvftxat a speed of vls ;zg5kfy (d70me* x$0.8c$ relative to a stationary observer on Earth. An event occurring in the spaceship is measured by an observer in the spaceship to have a duration of $12s$. What is the duration of the event as measured by the stationary observer on Earth?
A. 7.2s
B. 12s
C. 15s
D. 20s
参考答案: D
本题详细解析:
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