Hi! I\'m not sure if I was doing this correctly i got for a: 496 signals and b:

Question

Hi! I'm not sure if I was doing this correctly i got for a: 496 signals and b: 9.556 years and I wanted to check if these were right before I moved on. And I was wondering how to do the last two parts. Thank you! Twins Jack and Jill are exactly 20 years old. Jill jumps on a spaceship and flies round trip to Sirius (8.60 Light years away, as measured from Earth) with a speed of 0.9c. Both Jack and Jill agree to send a signal to the other after each week has passed.

a) How many signals does Jill receive from Jack before she turns around?

b) What tume does Jack measure when the frequency of signals he receives changes?

c) How many signals has Jack received at the time in (b)?

d) How many signals do Jack and Jill each receive by the time Jill returns?

Explanation / Answer

Hi! I'm not sure if I was doing this correctly i got for a: 496 signals and b:

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