Question

An instrument is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02 milliseconds. If the velocity of the waves is 3 × 10⁸ ms⁻¹, calculate the distance of the plane from the radar.

Answer 1

The distance of the plane from the radar is
Distance = Velocity × Time
= 3 × 10⁸ × 0.02 × 10⁻³ mmm
= 0.06 × 10⁵ m = 6 × 10³ m
= 6 kilometres.