Question

The speed of light is 3.00 x 108 m/s. How long does it take for light from the sun to reach the earth, 93 million miles away?

Answer 1

Answer:

8.3 minutes

Explanation:

93 million miles = 93*1.6 = 148.8 million km = 148.8 billion m or $148.8\times10^9m$

So the time it take for light from the sun to reach the earth at 93 million miles away at speed of $3\times10^8 m/s$ is

$t = \frac{148.8\times10^9}{3\times10^8} = 496 s$ or 8.3 minutes