national archives

national archives

The Sound of a Nuclear Bomb?

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Description

This is the raw footage of the Upshot-Knothole Annie Nuclear Weapons Test (March 17, 1953). It was filmed about 7 miles away from the detonation. You've probably seen videos of nuclear weapons tests in the past. Most of those are dubbed, probably with stock footage, so the detonation and its resulting noise occur at the same time. However, the speed of light travels at 671 million miles per hour. The speed of sound is much slower, just 768 miles per hour. Thus, the mushroom cloud actually appears well before the sound of the explosion. The explosion takes place at 2:37. You can see the mushroom cloud starting at 2:42. The sound doesn't appear until 3:09, a full 32 seconds after the initial white light. Read more at: http://www.guerrillaexplorer.com/strange-science/the-sound-of-a-nuclear-bomb/ Source: National Archives (Identifier: 25979)