1. (a). If the spaceship travels for 1 hour and emits a flash every 6 min,
calculate number of flashes will be emitted.
(b). The ship equally spaced 6-min flashes while approaching the receiver at
constant speed. Explain will these flashes be equally spaced when they
encounter the receiver.
(c). If the receiver sees these flashes at 3-min intervals, calculate the time will
occur between the first and the last flash (in the frame of reference of the
receiver)