A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
A) 13.4 s
B) 16.7 s
C) 12.5 s
D) 9.70 s
E) 6.03 s
Correct Answer:
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