2006-12-27 01:45:53 · 5 answers · asked by mostafa n 1 in Cars & Transportation ➔ Aircraft
Any sound frequency beyond the range of human hearing.
2006-12-27 04:26:34 · answer #1 · answered by Bostonian In MO 7 · 1⤊ 0⤋
Ultra Sonics are often used for NDT (Non-Destructive Testing). By sending an Ultra-sonic signal into a metal surface we listen for it to reflect from impurities. This reflected signal or lack of a signal tells us what is going on inside an a/c component.
This is a simplified description of an advanced technique. for more info try going to this site:
http://www.tubi-tak.com/ultrasonic_inspection.htm
2006-12-27 10:10:25 · answer #2 · answered by a6peacekpr9 2 · 0⤊ 0⤋
In relation to aircraft, you may be thinking of hypersonic, which in general can be described as "lickety-split" (I think it's 3X the speed of sound, may be higher. Anyone? I'll search too.
Seems to be agreed it's 5 times the speed of sound, see link:
2006-12-27 11:57:11 · answer #3 · answered by baron_von_party 4 · 2⤊ 0⤋
when the hedge hog moves really fast!
or very small vibrations used to clean gold ect!
2006-12-27 01:54:29 · answer #4 · answered by drow 1 · 0⤊ 0⤋
look in the dictionary
2006-12-28 13:27:02 · answer #5 · answered by kwadwo_adade 4 · 0⤊ 1⤋