3C55.35 – Beating/Tuning Forks
The experiment shows how 2 oscillators with slightly different frequencies will drift in and out of phase in a process called “beating”. The frequency of this beating is the difference between the frequencies of the 2 oscillators. If the difference is very large, a “difference tone” might be observed, where the beating becomes fast enough to be heard as a 3rd tone, but this experiment is not able to create such a tone.