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Ultrasonic wave

Revision as of 16:17, 3 February 2006 by Yslee (talk | contribs)
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진동수 1600c/sec이상이며 음으로서 귀에 들리지는 않은 음파를 말한다. 수정진동자에 고주파압을 가해서 발생시킴