Posted by Nick on .
A laser beam is directed at the Moon, 380,000 km from Earth. The beam diverges at an angle of 4.6×10−5 rad.
1. What diameter spot will it make on the Moon?

Physics 
drwls,
spot diameter =
distance * (divergence angle in radians)
The diameter will be in km if you use the distance in km. 
Physics 
Dick McDickenson,
3.14