I read in many posts that the acoustic impedance of a material is usually defined as $Z = pc$, where $p$ is the density of the material under consideration and $c$ is the speed of sound in that material. However, this is the "Characteristic specific acoustic impedance" as explained here:
I wonder how the acoustic impedance of a material is related to its dimensions, expecially the thickness.
E.g. if I have 1-atom-thick layer of copper, does this offer the same acoustic impedance of a 1 meter thick layer of copper? I guess that in that case I will have to refer to more general law.
Moreover, how does the acoustic impendace change with the frequency of the acoustic wave? E.g. Does a 100Hz acoustic wave that is hitting a certain material see the same acoustic impedance of a 1MHz acoustic wave hitting the same material?
Thank you in advance :)