The course deals with oscillations, waves and physical acoustics. It follows on from the basic physics course and goes further into the depth of the issue. He notices the fundamental thing and that oscillation and undulation are described by differential equations, in the case of oscillation these are ordinary, in the case of undulation partial differential equations that need to be solved. The problem of a real pendulum, where a nonlinear differential equation needs to be solved, is also presented for oscillation. Furthermore, the attention is focused on the investigation of sound as a special type of wave, the analysis of sound is solved using Fourier transforms, both continuous and discrete. And finally, acoustic quantities are defined and various matters of the broad field of acoustics are investigated, such as physiological acoustics, musical acoustics, building apostics, etc. Due to the breadth of the scope, it should be understood as an introduction to the issue.