ResonanceRESONANCE: "The property by which any vibrational system responds with maximum amplitude to an applied force having a frequency equal to its own." In English, this means that any solid object that is struck with a sound a wave of equal vibrations of the sound wave will amplify the given tone. This would explain why some singers can break wine glasses with their voices. The vibrations build up enough to shatter glass. This is called RESONANCE. Resonance can be observed on a tube with an open end. Musical tones can be produced by vibrating columns of air. When air is blown across the top of the open end of a tube, a compression wave passes along the tube. When it reaches the closed end, it is reflected. The reflected air molecules meet the incoming air molecules forming a knot at the closed end. When the air reaches the open end, the reflected compression wave becomes a rarefaction. It bounces through the tube to the closed end, where it is reflected. the wave has now completed a single cycle. It passed through the tube four times forming the closed tube, a quarter of the length of a sound wave. Using a continuous sound frequency, standing waves are produced in the tube. This creates a pure tone. We can use this knowledge of a fourth wavelength to create our proof. It does not only have to be done using the wind, but can also be demonstrated using tuning forks. If the frequency of the tuning forks is known, then v=f(wavelength) can find the length of the air column. Using a tuning fork with frequency 512 c/s, the speed of sound is 332+0.6 T m/s, being the temperature equal to 22 degrees, replace it in the formula. Calculate 1/4 wavelength V=f(wavelength)wavelength=V/f=345.2 (m/s) / 512 (c/s)=0.674 m/c1/4 d 'wave. =0.674 (m/c) / 4= 0.168 m/cSo the pure tone of a tuning fork with frequency 512 c/s at a temperature of 22 degrees would be 16.8 cm. The pure tone is C. If this were done with other tuning forks with frequencies of 480, 426.7,384, 341.3, 320, 288 and 256 c/s then a scale in the key of C would be produced. There are many applications of this in nature . An example of this would be the human voice. Our vocal cords create sound waves with a certain frequency, just like the tuning fork. One of the first applications of the wind instrument was made in ancient Greece where pan pipes were created.