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hyperacoustic zone |
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hyperacoustic zone [¦hī·pər·ə¦kü·stik ‚zōn] (geophysics) The region in the upper atmosphere, between 62 and 100 miles (100 and 160 kilometers), where the distance between the rarefied air molecules roughly equals the wavelength of sound, so that sound is transmitted with less volume than at lower levels. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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