Estimating the Speed of Light from Earth-Moon Communication

Details Estimating the Speed of Light from Earth-Moon Communication Estimating the Speed of Light from Earth-Moon Communication

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phtea..44..414k&link_type=abstract

The Physics Teacher, Volume 44, Issue 7, pp. 414-415 (2006).

Physics

General Physics

2

Demonstration Experiments And Apparatus, General Physics, Determination Of Fundamental Constants

Scientific paper

During the Moon landing of Apollo 16 on April 21, 1972, a spoken message from Earth is heard returning to Earth roughly 2.7 s later. The signal traveled from Earth to the Moon, from the earphone to the microphone of astronaut John Young's space helmet, and back to Earth. A recording of this ``space echo,'' available at Ref. 1, enables a simple approximate determination of the speed of light.

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