What is Resonance? September 10, 2006Posted by healthyself in Cell phone safety, Harmonics, Resonance, Vibration.
"Every object has a unique natural frequency (also called harmonic frequency) of vibration. A periodic force occurring at the same frequency as the natural frequency of vibration of an object may cause the object to vibrate when the objects come into contact. This is called (mechanical) resonance. An example of this is a singer singing at the natural frequency of a wine glass. This causes the glass to resonate (that is vibrate at the resonant frequency which is the natural frequency) thus causing the bonds within the glass to deform beyond what it can handle and thus shatter. (It is not possible for one note to shatter a series of glasses as each piece of glass would have its own natural frequency.) Another example is a poorly designed bridge which has the same natural frequency as soldiers marching accross it or of the wind blowing through it. The Tacoma Narrows Bridge is one example of a bridge which has collapsed as a result of wind putting energy into the bridge at the natural frequency of the bridge."