Question

the distance of a star is 6.4 *10^26 m . assume the speed of light is 3*10^8m/s calculate the time taken by light to the travel this distance. Also express it's order of magnitude​

Answer 1

ATQ; s = (6.4*10^26)m

         v = (3*10^8)m/s

Therefore, t=s/v

                   = (6.4*10^26)m / (3*10^8)m/s

                   = (6.4/3)*10^18

Answer 2

Answer:

2.13×10¹⁸seconds

Explanation:

Hint: TIME = DISTANCE/SPEED