Question

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?

Answer 1

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.