“Let’s tap into a cool experiment about sound resonance.”

Resonance, according to John Stuart Reid, Sonic Scientist, is that an object has a degree of movement/motion in response to sound or vibration. Every object has several sonic frequencies absorbing energy and becoming excited, called the Resonant Frequencies. And, there is always one frequency that is its Prime Resonant Frequency.

So resonant frequency is the natural frequency at which an object prefers to vibrate when excited by sound. It is inversely proportional to its mass.

Here is a simple experiment to show how this works using a tall drinking glass or a wine glass. It works best with a lead crystal glass.

  1. Tap a glass with a metal spoon and the glass will ring its Prime Resonant Frequency.
  2. Add water to the glass so it is half filled and notice the change in frequency.
  3. Repeat by fully filling the glass.

And yes, the frequency keeps falling as you tap the glass as it is slowly fills with water from a bottle.

Result – The mass of the object increases as its resonant frequency becomes lower. A half filled glass of water has a lower sound frequency.

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