Mission Control sends a brief wake-up call to astronauts in a distant spaceship.Five seconds after the call is sent,Mission Control hears the waking groans of the astronauts.How far away (at most)from Earth is the spaceship? A)7.5 $\times$ 10⁸ m B)15 $\times$ 10⁸ m C)30 $\times$ 10⁸ m D)45 $\times$ 10⁸ m E)The spaceship is on the moon.

Question

Quizplus · Accepted Answer

The speed of light is 3 x 10^8 m/s. In 5 seconds, light travels 3 x 10^8 m/s x 5 s = 1.5 x 10^9 m. The spaceship is at most 1.5 x 10^9 m away from Earth.

Mission Control Sends a Brief Wake-Up Call to Astronauts in a Distant