SPI RELATIONSHIPS
frequency and period ️️inverse
stiffness and propagation speed ️️direct
density and propagation speed ️️inverse
frequency and wavelength ️️inverse
power and amplitude ️️direct
proportional to amplitude squared ️️
intensity and power ️️dire...
frequency and divergence in the far field ✔️✔️inverse
aperture and near zone length ✔️✔️direct
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