Introduction. Modern physical models for calculating the propagation of plane longitudinal waves through media boundaries. based on the conditions of continuity of sound pressure and vibrational velocity. are implemented only with normal wave incidence. https://www.roneverhart.com/HP-ENVY-TE01-4147c-Desktop-Intel-Core-i7-13700-2-1-GHz-Intel-UHD-Graphics-770-32GB-DDR4-512GB-SSD-1TB-HDD-Windows-11-/