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by pvaldes
3931 days ago
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> the US navy does not care Maybe they should reconsider their position them for practical 'poorpoises', like saving the last 55 maui's dolphins remaining on earth, or preserving the truly unique native aquatic vertebrates frequenting the coasts of Hawaii in their annual migration. http://www.coupay.com/topoften/wp-content/uploads/2013/01/ob... Sound travels at 0.9 miles by second in the sea, so this poses a very interesting question about what should be a theoretical safe distance for a sonar. Maybe somebody here could answer this. I hope they keep the keys for this engine safe and not sound in any case. |
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Speed doesn't matter, it's all about the wavefront. The radar equation provides a rough guide here, in that the power of the signal drops off at a ratio proportional to the distance squared, the r^2 dependency. I have no idea what the rest of the terms in that equation would be, though, as I have only ever done the calculations for RF in air.