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Using the Atomic Bomb simulation program I wrote on my computer at home, simulating the MK-III Fatman bomb dropped on Nagasaki, the initial shockwave speed is about 310,000 meters/second. This will rapidly slow to a few times the speed of sound, then more gradually to the speed of sound.

Additional simulations indicate the initial speed remains well within an order of magnitude of this more or less regardless of yield.

Most conventional explosive shockwave speeds are between 5,000 & 10,000 meters/second for comparison.

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9y ago
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Q: What is the speed of the shockwave of an atomic bomb?
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