Decibels
http://en.wikipedia.org/wiki/Decibel
http://www.phys.unsw.edu.au/~jw/dB.html
http://www.measure.demon.co.uk/Acoustics_Software/db_demo.html
http://www.nidcd.nih.gov/health/education/decibel/decibel.asp (note: requires Flash/Macromedia plug-in)
All tested using OS 10.4/Firefox browser.
http://www.phys.unsw.edu.au/~jw/dB.html
http://www.measure.demon.co.uk/Acoustics_Software/db_demo.html
http://www.nidcd.nih.gov/health/education/decibel/decibel.asp (note: requires Flash/Macromedia plug-in)
All tested using OS 10.4/Firefox browser.
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