The recently launched Apple AirPod Pro presents a wonderful opportunity to relate an A-level concept to a real-world example – how noise-cancelling earphones work.
Apple’s website explained it in layman terms that seem to make sense. Let your students attempt to do a better job of explaining how destructive interference of waves is applied.
![](https://physicslens.com/wp-content/uploads/2019/10/how-noise-cancelling-airpods-work-1024x495.png)
![](https://i1.wp.com/physicslens.com/wp-content/uploads/2019/10/noise-cancelling-airpod.png?fit=720%2C348&ssl=1)
I probably won’t spend SGD379 on it though.