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|Jack||Last replied to at February 20, 2016, 11:32 am|
Why need ultrasound?
|Valentina||Last replied to at March 2, 2013, 4:05 am|
. Your explanation was cenlriaty the least complicated to fully grasp. I usually get annoyed whenever individuals discuss issues that these people plainly do not know about. You were able to hit the nail on the head and spelled out every thing without complication. Possibly, people could take a sign. Will likely be back to acquire even more. Many thanks
|Jenny||Last replied to at December 12, 2012, 5:00 pm|
Because Ultrasound is different from sound, it has much higher frequency, and the higher the frequency, the shorter the wavelength. For sound, with frequency is lower than 20kHz, the wavelength is very long, and thus the sound source is relative small compared to the wavelength, and in this way it becomes a point source, the sound wave spread in all the directions equally, no directivity. For ultrasound, for example, at 10MHz, the wavelength is only 0.15mm, and the energy will propagate as a beam, like light from a flash light.