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 × 107 meters? (Hint: Time is distance divided by rate.)
(I point)
01.26 × 1016 seconds
O1.26 × 1015 seconds
O1.4 x 101 seconds
O1.4 × 10-1 seconds
distance / rate = (4.2 x 10^7 meters) / (3 x 10^8 meters/second) = 1.4 x 10^-1 seconds.
=1.4 × 10^-1 seconds.