A certain star is 1.135 × 10^14 km away from Earth. If light travels at 9.4607 × 10^12 km per year, how long will it take for light from the star to reach Earth?

Question

asked Jul 17, 2019 176k views

1 Answer

Dave Friedel · Answer 1 · 2019-07-24T06:59:42+0000

Answer:

12 years will it take for light from the star to reach Earth.

Explanation:

As per the given statement: A certain star is 1.135 × 10^14 km away from Earth. If light travels at 9.4607 × 10^12 km per year.

⇒Speed of light travel =
9.4607 * 10^(12) km per year

and Distance of a certain star from the Earth =
1.135 * 10^(14) km

To find how long will it take for light from the star to reach Earth.

Using Formula:

$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$

or

$\text{Time} = \frac{\text{Distance}}{\text{Speed}}$

Substitute the given values we have;;

$\text{Time} = (1.135 * 10^(14))/(9.4607 * 10^(12))$

Simplify:

Time = 11.9969981 year ≈ 12 years

therefore, 12 years will it take for light from the star to reach Earth.