Question

A radar signal is reflected by an aeroplane and is received $2\times {10}^{-5}s$ after it was sent. If the speed of these waves are $3\times {10}^{8}m{s}^{-1}$, how far is the aeroplane?

Answer 1

Step 1: Given data

Time $\left(t\right)$ = $2\times {10}^{-5}sec$

The velocity of the waves $\left(v\right)$= $3\times {10}^{8}m{s}^{-1}$

Step 2: Calculate the distance $\left(s\right)$

We know that,

$v=\frac{2s}{t}$

$s=\frac{v\times t}{2}$

$s=\frac{2\times {10}^{-5}\times 3\times {10}^8}{2}$ = $3000m$

Hence, the aeroplane is $3000m$ away.