On 03/09/06, graywolf <[EMAIL PROTECTED]> wrote: > Supersonic means just above the human hearing range, ultrasonic means > far above it but below the range of radio waves. Usually that is > something like 15kc to 30kc for supersonic, and 30kc to 100kc for > ultrasonic waves. It is the frequency that is important to the label, > not the media. Note that the terms are used differently when used for > aircraft rather than electronics.
The transmission media is important as it's not convention to call VLF radio waves (3–30 kHz) Ultrasonic waves. -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
