An astronaut travels away from the Earth at a speed of 0.74c and sends a light...
An astronaut travels away from the Earth at a speed of
0.74c and sends a light signal back to the Earth every 9.0
s as measured by his clock. An observer on the Earth finds that the
arrival time between consecutive signals is Δt. Find
Δt. (Answer should be in seconds)
Homework Answers
time dilation: 
t =
*to=9/(sqrt(1-0.74^2*c^2/c^))
=13.38s
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