Question

radio wave of Speed 3 into 10 raise to 8 metre per second are reflected from the Moon and received back on the earth the time taken to do so is 2.5 second what is the distance of Moon from the Earth​

Answer 1

Answer:

Given:

Speed of radio wave = 3 × 10^8

Time taken for whole journey of wave

= 2.5 secs.

To find:

Distance between Moon and Earth.

Concept:

Radio wave is transmitted from earth. The wave traverses space and reaches moon. At moon it is reflected and starts it's journey towards Earth. Finally, the wave is received at the earth.

So the distance we will get is twice the actual distance.

Calculation:

Distance = Velocity × Time

=> Dist. = 3 × 10^8 × (2.5)

=> Dist. = 7.5 × 10 ^ 8

So the actual distance = (7.5 × 10^8)/2

=> dist. = 3.75 × 10^8 metres.

Answer 2

To Find :----

• Distance of Moon from the Earth ..

Given :-------

• Speed of radio wave = 3×10^8 m/sec
• Time taken by radio way from earth to moon and coming back to earth = 2.5 seconds...

$\huge{\mathfrak{\green{S}}}{\mathfrak{o}}{\mathfrak{\orange{l}}}{\mathfrak{\red{u}}}{\mathfrak{\pink{t}}}{\mathfrak{\purple{i}}}{\mathfrak{\blue{o}}}{\mathfrak{\red{n}}}$ :--------------------

we know that ,,

Distance = Time × velocity

D = S × T

Putting values we get,

D = (3*10^8) × 2.5

D = (3*10^8) × (25/10)

D = 3*10^7 * 25

D = 75*10^7

Now This is the Total Distance covered by radio wave .

while Going to moon and coming back to earth .

so,

our Actual Distance = (75*10^7)/2 = 37.5*10^7 m or, 3.75*10^8 metre ..

(Hope it Helps you)