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The acoustic characteristics of 111 kinds of leaves were determined using longitudinal ultrasonic waves (LUW) passing through the leaves suspended in water. The phase velocity of LUW in the leaves correlated with their thickness (r=0.776). In leaves LUW wavelengths were almost equal to leaf thickness (r=0.720). On the other hand, the group velocity did not correlate well (r=0.210). The more delayed...
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