Sóng dọc | PBS NC Science

https://www.pbslearningmedia.org/resource/3145f61c-363e-4e0d-81e7-b0a6af1632ed/longitudinal-waves-unc-tv-science/

Sóng âm | Khoa học thực hành

https://www.pbslearningmedia.org/resource/fun-with-physics-media-gallery/hands-on-science/

Khoa học vật lý

https://www.pbslearningmedia.org/subjects/science/physical-science/?rank_by=recency