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I believe the power expression you list is a power density (just like the pointingpoynting vector in E&M). Thus $P$ has units of $W/m^2$, which enforces $A$ to have units of $m$ which is the standard unit of amplitude for a wave.
I believe the power expression you list is a power density (just like the pointing vector in E&M). Thus $P$ has units of $W/m^2$, which enforces $A$ to have units of $m$ which is the standard unit of amplitude for a wave.
I believe the power expression you list is a power density (just like the poynting vector in E&M). Thus $P$ has units of $W/m^2$, which enforces $A$ to have units of $m$ which is the standard unit of amplitude for a wave.
I believe the power expression you list is a power density (just like the pointing vector in E&M). Thus $P$ has units of $W/m^2$, which enforces $A$ to have units of $m$ which is the standard unit of amplitude for a wave.
