Question

a radar is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02ms-¹. If the velocity of waves is 3×10*8 ms-¹, calculate the distance of the plane from the radar.​

Answer 1

Let the distance of the plane from the man be x....

as we know

when the waves will.come out from the radar it will reach the aeroplane i.e travel a distance x,,then it will again come back to.the radar covering the distance x

in this case

total distance travelled by the waves=2x

speed of the wave=3×10^8

time taken=.02S

we know, distance travelled=speed × time taken

so,

so,

2x=3×10^8×.02

x=3×10^6m

Hence total distance of the plane from the radar is 3×10^6m

{hope it helps you}