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5: As measured from Earth, the star Procyon is 11.4 light years away. Adam and Becca...

5: As measured from Earth, the star Procyon is 11.4 light years away. Adam and Becca are twins, and on the day of their 19th birthday Becca departs on a spaceship that will make the round trip to Procyon at a speed of 0.97c. Adam remains on Earth.

a) Assuming she spends no time at the star, calculate Becca’s age when she returns to Earth.

b) Calculate the difference in Becca and Adam’s ages when she returns to Earth.

c) A neutron has rest energy 939 MeV. Calculate the velocity of a neutron with kinetic energy 1550 MeV. Give your answer in terms of c.

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