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Calling all finite-element model experts :-) . I can only offer one small tidbit: for wind instruments, aside from the octave hole, which exists primarily to facilitate exciting the higher frequency notes, the tone is primarily defined by the distance from the mouthpiece to the first open hole. As a long-time clarinetist, I'm fully aware that the pitch ...


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According to the Wikipedia article on String theory, At sufficiently high energies, the string-like nature of particles would become obvious. There should be heavier copies of all particles, corresponding to higher vibrational harmonics of the string. It is not clear how high these energies are. In most conventional string models, they would be close to ...


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For the pipe, it is the air that is vibrating. When the column of air is shorter the frequency is higher. In the case of the wine glass, the glass (not the air) is vibrating. Add water and you increase the inertia of the glass, which lowers the frequency of the resonance. The air may also resonate - but for something the size of a wine glass the frequency ...


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The qualitative reason is in the case of the pipe, the walls can be assumed for practical purposes to be rigid (i.e. they don't vibrate), and the resonant frequency of the vibrations in the air inside is determined by the boundary conditions. In other words, the shorter the air column in the pipe (more water), the shorter the wavelengths of the acoustic ...


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There is two part in a pipe column : the excitation and the cavity The cavity select a wavelenght depending on its length. But the small open you see in a pipe, it's a menbrane which vibrate with every frequency as you blow (you create something that have every wavelength). It's only the cavity that will choose the good frequency/wavelenght. the stream ...


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The method that WiTricity implements is that of magnetic resonance coupling. Resonance is done to ensure efficient exchange of energy between the transmitter and the receiver. The method is very simple. If you take a coil and pass alternating current through it, it will produce alternating magnetic field around itself (like a solenoid). Now, place another ...



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