Question: At the Apache Point Observatory in New Mexico, laser pulses of 532-nm light containing 0.115 J of energy are aimed at the Moon. (a) How

At the Apache Point Observatory in New Mexico, laser pulses of 532-nm light containing 0.115 J of energy are aimed at the Moon.
(a) How many photons of light are in each pulse?
(b) The laser pulse spreads out to a spot of radius 2.0 km at the Moon's surface. The retro reflector mirror array left by the Apollo 15 astronauts has an area of about 0.60 m2. How many laser photons hit the mirror array?
(c) The reflected light spreads out to a spot of radius 2.0 km back at the Apache Point Observatory. How many reflected photons are collected by the 3.5-m-diameter telescope? (In practice only about 0.25 photon per pulse is collected.)

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