In a recent article in this journal there is a description of a method to determine the resonance of an air column, to calculate the speed of sound, using Lissajous curves. However, some theoretical aspects to improve the understanding of this technique, as well as some limitations of its use can be better exploited. This note was written with the aim of improving those aspects which should be useful for future readers of the paper.
Keywords
Acoustics; speed of sound; Lissajous curves; Kundt's tube; Laser Doppler vibrometer
