PROBLEM 105P

The distance from the sun to Earth is 1.496 × 108 km. How long does it take light to travel from the sun to Earth?

Solution 105P

Step 1:

Distance from the sun to Earth = 1.496 × 108 km.

Time light takes to travel from the sun to Earth = ?

We know the formula , Time =

We know, speed of light = 3108 m/s

Distance is given in Km and speed of light is in ‘m’, so, let’s convert distance in km to meters :

1 km = 1000 m

Hence, distance in ‘m’ is :

= 1.496 × 108 km

= 1.496 × 1011 m

Therefore, Time =

= 498.66 s.