Answered: This panel on the Moon reflects a laser…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter16: Fundamentals Of Light

Section: Chapter Questions

Problem 34A

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The Apollo 11 astronauts set up a panel of efficient corner- cube retroreflectors on the Moon’s surface (as shown). 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 s at a station where the Moon is at the zenith and take the center-to-center distance from the Earth to the Moon to be equal to 3.84 × 10⁸ m. (a) What is the measured speed of light? (b) Explain whether it is necessary to consider the sizes of the Earth and the Moon in your calculation.

This panel on the Moon
reflects a laser beam direcdly
back to its source on the Earth.
a
NASA

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