Question

The Apollo 11 astronauts set up a panel of efficient corner-cube retroreflectors on the Moon's surface (Fig. 35.8 $\mathrm{a}$ ). The speed of light can be found by measuring the time interval required for a laser beam to travel from the Earth, reflect from the panel, and return to the Earth. Assume this interval is measured to be 2.51 $\mathrm{s}$ at a station where the Moon is at the zenith. What is the measured speed of light? Take the center-to-center distance from the Earth to the Moon to be $3.84 \times 10^{8} \mathrm{m}$ . Explain whether it is necessary to consider the sizes of the Earth and the Moon in your calculation.

          The Apollo 11 astronauts set up a panel of efficient corner-cube retroreflectors on the Moon's surface (Fig.
35.8 $\mathrm{a}$ ). The speed of light can be found by measuring the time interval required for a laser beam to travel from the Earth, reflect from the panel, and return to the Earth. Assume this interval is measured to be 2.51 $\mathrm{s}$ at a station where the Moon is at the zenith. What is the measured speed of light? Take the center-to-center distance from the Earth to the Moon to be $3.84 \times 10^{8} \mathrm{m}$ . Explain whether it is necessary to consider the sizes of the Earth and the Moon in your calculation.

Added by Krystal C.

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