Beats feature in my talks. The talk this time will have a new audience participation time, with whistling lollipops given to each member of the audience. We will try and make a beat frequency together.
The first thing I found on IOPSpark was a SPT classroom activity using audacity. There is a nice way to use audacity with a police whistle to explore ghost frequencies.
What never ceases to amaze me about physics is when you look at a concept you will always find an application for it somewhere!
To test for poisonous gases in mines they used to have organ pipe with surface air in it and another with air pumped up from the mine. These pipes of same length were played together. If one pipes frequency was changed due to the gas from the mine being of a different density then a beat was heard.
We used to use beats to tune our cornets in Frodsham Silver Band.