Problem 9PE

There was a major collision of an asteroid with the Moon in medieval times. It was described by monks at Canterbury Cathedral in England as a red glow on and around the Moon. How long after the asteroid hit the Moon, which is 3.84×105 km away, would the light first arrive on Earth?

Solution 9PE

Step 1 of 2

The expression to find the distance travelled by light is,

d=ct

Here d is distance, v is the speed and t is the time.

Rearrange the expression for the time t,

t=