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Old 3rd Feb 2012, 17:40
  #1560 (permalink)  
CliveL
 
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Time between 'thumps'

I think the explanation is that the sound you heard was (and could only be) travelling through the air to reach your ear at the speed of sound. The distance between the shocks would be 204 ft, but the speed would have been 1100 ft/sec - i.e.about 0,2 seconds between them
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