https://winnerscience.com/4-types-of-ultrasonic-waves/ Science Articles for Winners Mon, 15 Oct 2018 09:49:31 +0000 hourly 1 https://wordpress.org/?v=6.9 https://winnerscience.com/4-types-of-ultrasonic-waves/#comment-619 Mon, 15 Oct 2018 09:49:31 +0000 https://winnerscience.com/?p=3394#comment-619 how to create an artificial propagating media for ultrasonic waves to pass through soil (soil testing)?
can you please elobrate this consupt? because most of the materials do not say the proper answer.Waiting for your answer

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