Question: One of the experiments placed on the Moon's surface by Apollo 11 astronauts was a reflector that is used to measure the Earth-Moon distance with

One of the experiments placed on the Moon's surface by Apollo 11 astronauts was a reflector that is used to measure the Earth-Moon distance with high accuracy. A laser beam on Earth is bounced off the reflector, and its roundtrip travel time is recorded. If the travel time can be measured to within an accuracy of 0.030 ns, what is the uncertainty in the Earth-Moon distance?

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