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?

Answer 1

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