Final answer:
The statement is true; a greater difference in acoustic impedance between two media results in more reflection at their interface, as reflected waves are used in ultrasound imaging to map internal body structures.
Step-by-step explanation:
The statement "The greater the difference in acoustic impedance of the two media, the greater the amount of reflection at their interface" is true.
Acoustic impedance (Z), defined by the formula Z = pv, is a material property in which p represents the density of the medium and v the speed of sound through the medium. The reflection of waves at the boundary between two different media depends on the difference in acoustic impedances (Z₁ and Z₂) of those media. A larger difference results in a greater reflection coefficient, leading to more energy being reflected and less being transmitted.
The principle of acoustic impedance is applied in medical imaging techniques such as ultrasound, where the reflections of sound waves are tracked and mapped to create images of the internal structures of the body.