A physics teacher asked a student to find how much time does the light take to reach the earth if the distance between the sun and the earth is `150xx10^(6)km`? Teacher also gives an extra input that velocity of light is `3xx10^(8)ms^(-1)`. What would be the answer of the student?

Explanation

Velocity of light, `c=3xx10^(8)ms^(-1)`
Distance of the sun from the earth,
`d=150xx10^(6)km`.
`=150xx10^(6)xx10^(3)m`
`150xx10^(9)m`
`:."Velocity"=("distance")/("time (t)")=500s`
`=8.33` minute
`:.` light takes 8.33 minute to reach the surface of the earth from the sun.