Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10-3S. How far is the aircraft from the antenna? [c = 3 x 108ms-1 ]
The correct answer is: D
Explanation
Time = 1 x 4 x 10-3secdistance = velocity x time
= 3 x 108 x 4 x 10-3
= 6 x 105m