Twin a makes a round trip at 06c to a star 12 light-years, Ask an Expert

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Twin A makes a round trip at 0.6c to a star 12 light-years away, while twin B stays on the earth. Each twin sends the other a signal once a year by his own reckoning.

(a) How many signals does A send during the trip? How many does B send?

(b) How many signals does A receive? How many does B receive?

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