An isotropic point source located in an open, uniform medium emits a continuous harmonic sound wave of constant power with negligible energy absorption by the medium. Microphone A, which has a small circular diaphragm of radius \(R\), is positioned at a distance \(r_A = 2.0\text{ m}\) from the source and detects an incident sound power \(P_A\) and a pressure wave amplitude \(\Delta P_A\). Microphone B, which has a small circular diaphragm of radius \(2R\), is positioned at a distance \(r_B = 6.0\text{ m}\) from the source and detects an incident sound power \(P_B\) and a pressure wave amplitude \(\Delta P_B\), with both diaphragms oriented perpendicular to the incoming wave fronts. What are the ratio of the incident sound power \(\dfrac{P_B}{P_A}\) and the ratio of the sound wave pressure amplitude \(\dfrac{\Delta P_B}{\Delta P_A}\)?