Question

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?

Answer 1

1.28 s

Step-by-step 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 =
`(d)/(c)`

Substitute 3.58 x
`10^(8)` m for d and 3 .00 x
`10^(8)` m/s for c in the expression of time,

t =
`(3.58 * 10^(8 ) m )/(3.00 * 10^(8) m/s)` = 1.28 s

Hence light will arrive at earth after.

1.28 s