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加分题 [时间膨胀] [长度收缩] ~ref填空11~ π+介子是不稳定的粒子,在它自己的参照系中测得平均寿命是 4.5 x 10^-8 s ,如果它相对于实验室以 0.99c 的速率运动,那么 (1) 实验室坐标系中测得的介子的寿命是_______ s . (2) 实验室坐标系中测得π+在衰变之前沿着路径向下移动多远? (3) 承上题,在它自己的参照系中测得移动多远?
F.
(3) 200 m G. (3) 680 m
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