• When you strike a solid object, it might ring with a tonal sound. The frequency of that sound is called the object's "harmonic." That frequency can vary depending on the object's material or shape, amongst other things. If you impose a sound of the exact same frequency of an object's harmonic, that object will vibrate at that frequency. If you blast an object with sound at its harmonic with enough power and time, eventually that object will vibrate so much that it will break. Thus, it is impossible to state what frequency will break a piece of glass. It all depends on its harmonic frequency. A human might hear a sound that would break a glass, or maybe not.

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