Общая физика | Л23: Элементы теории волн. Волновое уравнение. Поперечные и продольные колебания

New channel Faculty of Physics : title sample judged 'whole' (Nearly all uploads are research seminars, full lectures, lab demonstrations, and technical tutorials from a university p); passed a second screen for sellers/exam-prep/re-uploads; 2 of 3 sampled transcripts showed teaching, 0 not; every title checked strictly; oEmbed verified.