[领域] 普物相对论 (题目相关领域) [来源] 课本习题 (课本习题、考古题、参考书...) [题目] Jessica embarks on a cosmic journey at a speed of (12/13)c relative to Earth. Before leaving, she tells her twin brother Tom, who stays on Earth, that she will travel outward for 26 yr of Earth time, then back for another 26 yr of Earth time. Tom will thus be 52 yr older when she returns, She promises to send a radio message on each of her birthdays.With what interval in her rest frame does Jessica receive these messages during the outward part of the journey? During the return trip'? Use this information to calculate how much Jessica ages during her trip according to an Em1h-based clock. [瓶颈] (写写自己的想法，方便大家为你解答) 由光的Doppler得知去程两讯息的的周期是5年,回程是0.2年 但是第三小题就不会写了,请大家帮帮忙~ 我猜是Tom花了50年(五年一次)收到去程的10个讯息,剩下两年(0.2年收一次) 总共20个讯息 所以Jessica二十岁,但不我知如何解释为何要花50年收前10个讯息 --

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