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 (in s) after the asteroid hit the Moon, which is 3.58 ✕ 105 km away, would the light first arrive on Earth?

1.28 s

Explanation:

The expression to find the distance traveled by light is,

d = ct

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

Rearrange the expression for the time,

t =

Substitute 3.58 x m for d and 3 .00 x  m/s  for c in the expression of time,

t = = 1.28 s

Hence light will arrive at earth after.

1.28 s

the independent variable, or the one that is intentionally manipulated is the speed.