: " The property whereby any vibratory system responds with maximum amplitude to an applied force having the a frequency equal to its own." In english, this means that any solid object that is struck with a sound wave of equal sound wave vibrations will amplitude the given tone. This would explain the reason why some singers are able to break wine glasses with their voice. The vibrations build up enough to shatter the glass. This is called RESONANCE. Resonance can be observed on a tube with one end open. Musical tones can be produces ....