Question

the distance of the galaxy from earth is 5.6×10^25m assuming the speed of light to be 3×10^8m s^-1 find the time taken by light to travel this distance ​

Answer 1

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Answer 2

Given that,

The distance of the galaxy from earth is, $d=5.6\times 10^{25}\ m$

Speed of light, $v=3\times 10^8\ m/s$

To find,

The time taken by light to travel this distance.

Solution,

The formula of speed of an object is given by total distance divided by total time taken. So,

$v=\dfrac{d}{t}$

t is time taken by light to travel this distance ​

$t=\dfrac{d}{v}\\\\t=\dfrac{5.6\times 10^{25}}{3\times 10^8}\\\\t=1.87\times 10^{17}\ s$

So, the time taken by light to travel this distance ​is  $1.87\times 10^{17}\ s$.

Learn more,

Speed, distance and time

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