The study of sound aves with high frequencies beyond the upper limit of human hearing or 20 thousand Hz. This technique is employed to locate a tumour, to scan a pregnant woman’s abdomen in order to produce a picture of foetus or to treat certain neurotically disorders.
These are the sound waves which have the frequencies lowest than the lowest limits of human hearing or 20 Hz.
Friday, August 16, 2013
What is Difference Between Ultrasonics and Infrasonic
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