A given piece of glass, like all mechanical systems, has a characteristic resonance frequency. And it is rigid. There will be one frequency that the glass will "like" and it will dance to it...
The vibrations. If a glass exhibits resonance (a clear tone when struck or tapped it exhibits resonance) it can be shattered by using sound waves at that frequency. This causes distortions in the...
The answer is "it's own resonant frequency".. this frequency is dependent on how the glass is made. You can hear this frequency when you rim the glass with a wet finger or smack it with a pen. If you...