What does resonance have to do with humming Crystal Glass?
please i need to know word by word explanation about it and i need it ASAP... thank you so much
Best answer:
Answer by Gerry
Crystal, resonates at one particular harmonic frequency. Try getting a crystal wineglass, dipping your finger in water, and rubbing it gently around the rim of the glass. Your finger will vibrate on the glass, and once you get it right and consistent, the glass will 'hum. Waves of any sort set up sympathetic vibrations in the materials they impinge upon. The glass hums (and doesn't shatter) because the amplitude of the waves (the actual physical displacement that creates the sound) is not sufficient to surpass the strength of the glass. If you generate a sound that is the same frequency the glass resonates at, after you turn off the sound, the glass will hum a little, much like a pitchfork. To break the glass, you need to broadcast not only a sound that is *just* the right frequency, but also has a high enough amplitude (loudness) to exceed the strength of the glass to resist those vibrations. When the sound gets too loud for the glass to vibrate, it shatters the glass.
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Resonance is when you push something at the frequency it naturally wants to go. Like pushing a child on a swing. If you push randomly the kid will be jerked around and not go far, but if you time your pushes to go with the swing, the kid will swing higher and higher.
A crystal glass: imagine bending it a tiny tiny amount and letting go (an easier thing to imagine is bending a ruler that is hanging over the edge of a table and letting go.) The ruler would twang and vibrate back and forth. It has a natural frequency. So does the glass. It is just harder to see the glass motion because it is so tiny. You’d probably need a magnifying glass, and besides the vibration is so quick it would be a blur.
Any given glass will have a natural frequency that it would vibrate at if you hit it (not so hard that you break it!) So it can resonate, but you would have to push it gently over and over during each vibration at just the right moment, like timing your push of the kid for the moments when the kid is at the bottom of the swing and moving forward. Since the vibration of crystal is hundreds of times per second, how can you vibrate something that quickly? By making a *sound.* Sound vibrations go that fast, and if you hit just the right musical note, you are vibrating at just the right frequency to push the crystal to vibrate farther and farther, and when the crystal vibrates, it makes more noise at the same note, so you hear the crystal “hum.”
In theory, an opera singer can shatter a glass if she hits just the right note and does it loudly enough close enough to the glass. I think this has been done but it is definitely used in many movies and TV shows.
Good luck. I hope this helps you understand what is going on.