Question

The distance from the Moon to Earth is 5.46 * 108 km. How long does it take a laser need to travel between the moon and earth?

a. 1.64 X 1020 s
b. 1.82 X 103 s
c. 1.82 s
d. 0.182 s
e. 1.64 X 1017 s

Answer 1

B. 1.82(10³) seconds (1820 seconds)

Step-by-step explanation:

Speed of Light: 3.00(10⁸) m/s or 3.00(10⁵) km/s

We know the distance from the Moon to Earth as 5.46(10⁸) km

We simply divide the distance by the speed of light:

`(5.46(10^8))/(3.00(10^5))`

We should get 1820 seconds or B. 1.82(10³) as our answer.