Question

radio wave sent from the Earth towards the surface of moon are received back on the earth after reflection in 2.5 second if the velocity of the radio wave is 3 *10^8 metre/second calculate the distance of the Moon from the Earth​

Answer 1

Answer:

Given:

Radio waves sent from Earth is received in Earth again after 2.5 seconds after reflection from moon

To find:

Distance between Earth and Moon

Concept:

2.5 seconds is the time taken to travel from Earth to moon and again from Moon to Earth.

So wave actually travelled twice the distance.

Calculation:

Let distance between Earth and Moon be

"d".

$\therefore 2d = (3 \times {10}^{8}) \times 2.5$

$= > d = (3 \times {10}^{8}) \times \dfrac{2.5}{2}$

$= > d = 3.75 \times {10}^{8} metres$

So final answer :

$\boxed{ \red{ d = 3.75 \times {10}^{8} metres}}$