Question

The sun is 1.5 X 1011 m from earth. Light produced by the sun travels toward the earth a constant speed of 3 X 108 m/s. If the sun suddenly vanished from the sky, how long would it take for people on earth to see that the sun had disappeared?

Answer 1

Answer:

The time is $t = 500 \ s$

Explanation:

From the question we are told that

  The distance of the sun from the earth is $d = 1.5 *10^{11} \ m$

   The speed of light is  $c =3.0 *0^{8} \ m/s$

Generally the time it would take is  

        $t = \frac{d}{v}$

=>     $t = \frac{1.5*10^{11}}{3.0*10^{8}}$

=>      $t = 500 \ s$