This experiment is one that I have noticed while doing my electricity shows. I use a balloon in the show to demonstrate positive and negative static charges. While holding this balloon, I noticed that I could feel a variety of sounds, especially when I was using a microphone and loud speaker.
I hope that you made your own Whistle Stick, and have been playing...., I mean experimenting with it. I also hope that you spent some time thinking about the science behind the sound that it makes, because that is what we are going to explore this time. For your exploration, you will need:
Today I was playing with sound experiments, and had so much fun with this one that I thought I would share it. It is based on the original phonographs, which used a very similar setup to play recordings of music or voices. They used a large cone to increase the volume of the sound.
This experiment is a trick that my Grandfather taught me when I was very young. He called it a "whistle stick", and making one brought back delightful memories from my childhood. This experiment requires the use of a sharp knife, so if you are young, you may need adult assistance. It is not difficult, but even adults should keep safety in mind.
If you have ever played with a tuning fork, you know that they are interesting and fun, but they can also be expensive. For this experiment, we will use a regular fork from your kitchen to produce a beautiful tone.
Any time you hear a sound, it is because something is vibrating. Place your fingers against your throat and hum. You will feel your throat vibrate. We usually hear sounds from vibrations that travel through the air, but solids can be much better at carrying vibrations.