Question

How much time does light from the sun approx. take to reach the surface of the earth?

• A. 400s
• B. 500s
• C. 450s
• D. 555s

Answer 1

The correct option is B 500s

We know that distance of sun from earth = $149.6\times {10}^{6}km$
$=149.6\times {10}^{9}m$
Speed of light in vaccum = $3\times {10}^8\frac{m}{s}$
Hence time taken by light to travel from sun to earth = $\frac{149.6\times {10}^6}{3\times {10}^8}$
$=500sec$.