Question: By measuring the go-and-return time for a laser pulse to travel from an Earth-bound observatory to a reflector on the Moon, it is possible to

By measuring the go-and-return time for a laser pulse to travel from an Earth-bound observatory to a reflector on the Moon, it is possible to measure the separation between these bodies.
(a) What is the predicted value of this time?
(b) The separation can be measured to a precision of about 15 cm. To what uncertainty in travel time does this correspond?
(c) If the laser beam forms a spot on the Moon 3 km in diameter, what is the angular divergence of the beam?

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a The distance from the Earth to the Moon is d em 382 x 1... View full answer

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