Question

The distance between the earth and the moon is about 384,000 km. calculate the time it takes for light to travel from the moon to earth?

Answer 1

But the answer is `~~1.28s`

Explanation:

The speed of light (`c`) is constant everywhere, it is `299","792","458 m"/"s=299","792.458km"/"s`

Therefore, it takes `(384","000)/(299","792.458)~~1.28s` for the light to travel from the moon to earth.