Question

Distance of galaxy from earth is 7.8×10^22km and speed of light is 3×10^8 m/s find the time taken by light to travel the distance

Answer 1

speed = distance/ time

7.8×10^22/3×10 ^8

if we take 10^8 upper then it becomes

7.8×10^14/ 3

=2.6×10 ^14 ( after dividing by 3)

ans=2.6×10^14

Answer 2

Amswer:

time = 2.6×10^14 m/s

Explanation:

time = distance/speed

time = 7.8×10^22 / 3×10^8

time = 7.8×10^14 / 3

time = 2.6×10^14 m/s