As the wavelength is decreased (or frequency is increased) the ultrasound beam will have a shallower penetration. Low frequency ultrasound has superior penetration . Since wavelength and frequency are inversely related, so to, are resolution and penetration inversely related.
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One of the most fundamental laws of physics, as it relates to wireless, is that lower frequencies travel farther and penetrate buildings deeper (or propagate better) than higher frequencies .
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