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A Radar Sends a Signal to an Aircraft at a Distance of 30 Km Away and Receives It Back After 2 X 10^-4 Second. What is the Speed of the Signal? - Physics

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Question

A radar sends a signal to an aircraft at a distance of 30 km away and receives it back after 2 x 10-4 seconds. What is the speed of the signal?

Solution

Given t =2 x10-4

d = 30 km = 30 x 103 m

Speed of the signal = ?

Let ‘d’ be the distance of aircraft from the radar, then the total distance travelled by the wave in coming and going back = 2 d.

"Velocity of wave, V"=("Total distance travelled, 2d")/"Time taken, t"

=(2xx30xx10^3)/(2xx10^-4)

=3xx10^8 m/s

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