Kundt's Tube Experiment Using Smartphones
Physics Education Volume 50, Number 4, ISSN 0031-9120
This article deals with a modern version of Kundt's tube experiment. Using economic instruments and a couple of smartphones, it is possible to "see" nodes and antinodes of standing acoustic waves in a column of vibrating air and to measure the speed of sound.
Parolin, S.O. & Pezzi, G. (2015). Kundt's Tube Experiment Using Smartphones. Physics Education, 50(4), 443-447.