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noise level |
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noise level [′nȯiz ‚lev·əl] (physics) The intensity of unwanted sound, or the magnitude of unwanted currents or voltages, averaged over a specified frequency range and time interval, and weighted with frequency in a specified manner; usually expressed in decibels relative to a specified reference. 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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If these results merely represented the background level of CA-MRSA colonization in the general population, this difference would not be expected. In this study (the Hokkaido Study on Environment and Children's Health), the effect of prenatal exposure to background levels of PCBs and dioxins on infant neurodevelopment in Japan/Sapporo was elucidated. According to a 2003 study, Bradley Landfill's leachate contained tritium at 20,100 picocuries per liter over the drinking- water limit - that's 1,000 times the normal background level. |
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