Ping Pong Ball Sound Resonance Demonstration

A Signal Generator is set to 320 Hertz and attached to a loud speaker. The loud speaker is brought towards a timber resonance box which has a natural resonance of 320Hertz. A tuning fork is stuck in the top of the box, and a ping pong ball is hanging from a string, and is just touching one of the forks of the tuning fork. ... https://www.youtube.com/watch?v=ZLd4p9r-TDI