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The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding error in the earth-moon distance?

• Physics repost please clarify -

How far does light travel in .19ns?

distanceerror=c*deltatime
that will give you the distance error

• Physics repost please clarify -

I think I am missing it. How do I get the change in time.

• Physics repost please clarify -

change in time is given. That time is infact the time error.

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