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

Answer:

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 = $\frac{d}{c}$

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 = $\frac{3.58 * 10^{8 } m }{3.00 * 10^{8} m/s}$ = 1.28 s

Hence light will arrive at earth after.

1.28 s