Radio waves emitted from an antenna are picked ... - JAMB Physics 1993 Question
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 10 5km
correct option: d
Time = 1 x 4 x 10-3sec
distance = velocity x time
= 3 x 108 x 4 x 10-3
= 6 x 105m
distance = velocity x time
= 3 x 108 x 4 x 10-3
= 6 x 105m
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