Question

A signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station ? The signal travels at the speed of light, that is $3\times {10}^8$ m/s.

• A. 10¹⁰ m
• B. 9 m
• C. 9 x 10¹⁰ m
• D. 7 x 10⁹ m

Answer 1

The correct option is C

9 x 10¹⁰ m

We know that, distance = speed x time

Here, speed = $3\times {10}^8$ m/s

Time = 300 s

So, distance =$(3\times {10}^8\times 300)$ m = $9\times {10}^{10}$ m