A radar pulse is bounced off the Moon at a distance of 400,000 km.What is the time from the transmitting of the pulse until its return?

Question

Quizplus · Accepted Answer

The time taken for the pulse to travel to the Moon and back can be calculated using the formula: time = 2 x distance / speed of light.
Assuming a speed of light of 3 x 10^8 m/s, the distance of 400,000 km can be converted to meters by multiplying by 1000. Therefore, the distance is 4 x 10^8 m. 
Substituting the values in the formula, we get:
time = 2 x 4 x 10^8 / 3 x 10^8
time = 2.67 seconds
Hence, the answer is C) 2.67 s.

A Radar Pulse Is Bounced Off the Moon at a Distance