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Speed of Light
Speed of Sound

Encountered phenomenon that illustrates the difference between speed of light and speed of sound?

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Wiki User
August 17, 2008 5:54PM

If someone driving in fence-posts with a hammer is observed at a distance of several hundred yards, it will be apparent that the sound of the hammer striking the post is not coincident with the action; it will be heard as the hammer is being raised for the next stroke. The same effect can be observed when watching a pile-driver at a similar distance.