Question

Light travels at a speed of 1.86x10^5 mi per sec. If the distance from a star to a planet in its orbit is 8.66x10^7 mi, how long (in seconds) does it take light travel from the star to the planet

Answer 1

The Time taken by light to travel from star to the planet is 480 seconds

Explanation:

Given as :

The speed of light is
`1.8* 10^(5)` mile per sec

The distance from star to a planet in its orbit =
`8.66* 10^(7)` mile

Let the time taken by light to travel from star = T sec

So, Time =
`(Distance)/(speed)`

Or, Time =
`(8.66* 10^(7))/(1.8* 10^(5))`

∴, Time = 4.80×10² sec = 480 second

Hence The Time taken by light to travel from star to the planet is 480 seconds Answer