| http://www.w3.org/ns/prov#value | - where ??(f,l) is the attenuation and in general is a function of the propagation distance, l, and frequency, f; A1 is the amplitude of the propagating ultrasonic wave at a distance, l, from the generating transducer; and AI is the initial amplitude of the ultrasonic wave in the medium at the site of the generating transducer.
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