Shrill high voice to break the glass was not only found in the movie. A singer who sang the voice on the right frequency and amplification can break the glass.
The influence of the singer's voice on the glass has been demonstrated in 2005. When the rock singer Jaime Vendera recruited by the Discovery Channel program, Mythbusters to test a strong voice.
"It took several attempts, he was finally able to shatter a wine glass with his voice," as written by LiveScience, Friday, May 31, 2013.
In accordance with the laws of physics, all objects have a natural frequency, the frequency that can make an object vibrate. If a wine glass knocked it by a fork, a buzzing sound that's produced its natural frequency.
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| Does this opera singer have the pipes to break glass? Maybe. (Picture from: http://www.livescience.com/) |
Similarly, the human voice is also capable of producing a similar natural frequency to vibrate the glass. Phenomenon is known as resonance occurs because the singer's voice in the air particles move close to crashing the glass like an invisible wave.
When the singer's voice amplified, these waves will propagate more powerful. With proper amplification, the glass can vibrate so strong that it broke.
Of course, to get such dramatic results, the conditions must be right. It would be easier for singers to crack the glass is very thin. Moreover, if a glass of wine already has some small cracks, it would be easy for a singer to crush it to pieces.
"I do not feel special," said Vendera. "I was also taught how to do it. A friend of mine, Jim Gillette from the 1980s heavy metal rock band Nitro, which ordinary breaks wine glasses with the help of amplifiers, and it was he who taught me to do it." *** [EKA | FROM VARIOUS SOURCES | LIVESCIENCE | MAHARDIKA SATRIA HADI | KORAN TEMPO 4250]
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