Radio waves emitted from an antenna are picked up by a radar after reflection from...
PHYSICS
JAMB 1993
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 ]
- A. 6.0 x 102ms-1
- B. 1.2 x 103km
- C. 3.0 x 103km
- D. 6.0 x 105km
Correct Answer: D. 6.0 x 105km
Explanation
Time = 1 x 4 x 10-3sec
distance = velocity x time
= 3 x 108 x 4 x 10-3
= 6 x 105km
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