The Apollo astronauts placed a reflector on the Moon’s surface. Astronomy students at Cal-Tech pointed a laser beam at the moon and received the signal about 2.6 seconds later. Use the speed of light to calculate the distance from the Earth to the Moon.

The Apollo astronauts placed a reflector on the Moon’s surface. Astronomy students at Cal-Tech pointed a laser beam at the moon and received the signal about 2.6 seconds later. Use the speed of light to calculate the distance from the Earth to the Moon.

Stars and Galaxies (MindTap Course List)

10th Edition

ISBN:9781337399944

Author:Michael A. Seeds

Publisher:Michael A. Seeds

Chapter1: Here And Now

Section: Chapter Questions

Problem 8P

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Question

The Apollo astronauts placed a reflector on the Moon’s surface. Astronomy students at Cal-Tech pointed a laser beam at the moon and received the signal about 2.6 seconds later.

Use the speed of light to calculate the distance from the Earth to the Moon.

Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.

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