Larger-scale applications of active noise reduction by destructive interference are contemplated for entire passenger compartments in commercial aircraft. So, sound being a wave, we expect it to exhibit interference we have already mentioned a few such effects, such as the beats from two similar notes played simultaneously.įigure 2 shows a clever use of sound interference to cancel noise. In fact, one way to prove something “is a wave” is to observe interference effects. Interference is the hallmark of waves, all of which exhibit constructive and destructive interference exactly analogous to that seen for water waves. Some types of headphones use the phenomena of constructive and destructive interference to cancel out outside noises.
Describe how sound interference occurring inside open and closed tubes changes the characteristics of the sound, and how this applies to sounds produced by musical instruments.Identify instances of sound interference in everyday situations.Define antinode, node, fundamental, overtones, and harmonics.By the end of this section, you will be able to:
