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


B

Physics & Space Science

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