Question

Radio signals travel at a rate of 3 × 108 meters per second. How many seconds would it take for

a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height
of 4.2 x 107 meters? (Hint: Time is distance divided by rate.)
01.26 x 1016 seconds
01.26 x 1015 seconds
01.4 x 10¹ seconds
01.4 x 10-¹ seconds

Answer 1

0.14*10⁻¹ seconds

Explanation:

3 × 10⁸ = 30*10⁷

Then:

4.2*10⁷ / 30*10⁷ = 4.2/30 = 0.14

0.14 = 1.4*10⁻¹ seconds