Posted by **Mary** on Wednesday, October 17, 2007 at 10:04am.

I apologise for reposting this question but it is still not working out for me.

I know that:

speed of light c=3.0x10^8

Time interval delta t=0.19x10^-9s

The relationship between actual time and roudtrip distance is

d=ct

Also if there is and uncertainty of delta time, then it introduces an uncertainty of delta distance

ie d+delta d = c(t + delta t)

Knowing all of this I still don't understand how to work out the problem. I am continuosly coming up with the incorrect answer. please help!

Question:

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?

## Answer This Question

## Related Questions

- chemistry -repost - Still can't figure this one out-- sorry for reposting, this...
- rate of reaction (formatted repost) - I can't get my table to line up so I've ...
- Physics - Suppose the observed motion of a moving airplane, illustrated by a ...
- Class 11th Physics - My question is that, I read about Instantaneous Speed "...
- Physics - These are “plug-in-the-number” tasks to familiarize you with the main ...
- Physics,Question ,Solved but about Units? - These are “plug-in-the-number” tasks...
- general physics - We can interpret a distance traveled of 7.43 to mean a ...
- physics - Question: 15 of 30: The distance versus time plot for a particular ...
- physics - Use the fact that the speed of light in a vacuum is about 3.00x1000 m/...
- To Lynn,Alex,Physics_student,Natasha - Please refrain from reposting the same ...

More Related Questions