Environmentalists constantly worry about man-made activity allegedly causing climate change. From a report of the Associated Press via Fox News about the ancient Yellowstone volcano and another such report about Indonesia's Krakatoa, however, we are again reminded how environmentalists unduly flatter the human race with tales of our power over the environment.
Two of the world's historic super volcanoes, Yellowstone and Krakatoa, have recently shown signs of activity which could result in eruptions. Yellowstone has been rising at 3 inches per year over the last three years--three times normal. While the Yellowstone report quotes a geologist who reassures us that a Yellowstone eruption does not appear imminent (which is a good thing, because a massive eruption could devastate the entire North American continent) , the Krakatoa eruption appears imminent:
Krakatoa's massive 1883 blast, heard nearly 2,000 miles away in Australia, sent pyroclastic surges of gas and burning ash which, combined with a tsunami, wiped out 165 villages and killed at least 36,417 people.
Yellowstone and Krakatoa remind us of man's somewhat paltry role in the world's environmental destiny.
Your analysis is incoradrect. It is polsibse to get an overadpresadsure of more than 1 atmoadsphere, without ever going to “negative pressure” which is indeed a curious concept that I doubt we will do in any macadroadscopic device.There are a couple of issues. Over 140dB SPL or so, the whole idea of linadearity in atmoadspheric transadmisadsion of sound falls pretty much comadpletely apart, for instance. Air is, strictly speaking, a linear medium for sound waves only at zero intensity, but in fact nonadlinadearadities do not start to show up until in the 90dB range, become pretty obvious at 120dB if you’re looking, and the whole idea of linadearity starts to fall apart at 140dB (all dB SPL, of course, unweighted).A point you might want to make is that the brownian motion at the eardrum creates a white noise (20Hz to 20kHz) level of about +6dB SPL (which you can’t hear because there is too little energy in any one ERB or Critical Band). There is, thereadfore, a limit at low levels, asa0well.All in all, you might want to make the point that the sound pressure we are designed to process is from about 2x10^-10 atmoadsphere to about 10^-5 atmoadsphere. That’s from 0a0dB SPL to 94dBa0SPL.
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Posted by: truthimmorb | December 15, 2010 at 03:58 AM
This is sad how the environment is polluted out of control.There is a lot we can do about it and must...we must step up and do out bit.Stop polluting.
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