BRAINCAKEAcoustic Impedance
How much ultrasound is reflected at a boundary depends on a property of each medium called its acoustic impedance Z. It is defined as the product of the density ρ of the medium and the speed of sound c in it:
Z = ρc
The unit of Z is kg m−3 × m s−1 = kg m−2 s−1.
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All 20 lessons in Medical Imaging · All OCR A-level Physics topics