Question

Amanda pilots a space ship away from earth at a speed of 0.775c. At some moment she sends a light pulse toward earth. Exactly one year later she sends another pulse toward earth.

(a) As measured in an inertial frame in which the earth is at rest, what is the difference in time between the generation of the two pulses?

(b) What is the difference in time between detection of the two pulses on earth?

Treat the earth as stationary, i.e. ignore its orbital motion about the sun.

Answer 1