Final answer:
Acoustic impedance cannot be changed by varying the wave pressure as it is inherent to the material's properties. It affects the reflection and transmission of wave energy at the boundary between different media.
Step-by-step explanation:
Acoustic impedance cannot be modified by varying the wave pressure. Acoustic impedance is a property of a medium that determines how much resistance an acoustic wave encounters as it passes through the medium. It is the product of the density of the medium and the speed of sound within that medium. Therefore, it is a characteristic of the material itself, rather than something that can be altered by changing the wave pressure. At the boundary between media of different acoustic impedances, the interaction of the wave with the media results in some of the wave energy being reflected and some transmitted. When there is a greater difference in acoustic impedance between two media, it leads to greater reflection and lesser transmission of the wave energy.