# During the Apollo XI Moon landing, a retroreflecting panelwas erected on the Moon’s surface. The speed of lightcan be found by measuring the time it takes a laser beamto travel from Earth, reflect from the panel, and return toEarth. If this interval is found to be 2.51 s, what is the measuredspeed of light? Take the center - to - center distancefrom Earth to the Moon to be 3.84 x 108 m. Assume theMoon is directly overhead and do not neglect the sizes ofEarth and the Moon.

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During the Apollo XI Moon landing, a retroreflecting panel
was erected on the Moon’s surface. The speed of light
can be found by measuring the time it takes a laser beam
Earth. If this interval is found to be 2.51 s, what is the measured
speed of light? Take the center - to - center distance
from Earth to the Moon to be 3.84 x 108 m. Assume the
Moon is directly overhead and do not neglect the sizes of
Earth and the Moon.

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