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What you say is partially right Miha. Though all bodies can vibrate at almost any frequency, they also have a set of frequencies that they can naturally vibrate at - with the least amount of energy. The lowest of these frequencies is called the fundamental frequency. The other frequencies called harmonics are multiples of this frequency. As with most things in physics there are equations to calculate the natural frequencies various different things For instance for a stretched string like in a piano the equation is Where f is the natural frequency,F is the tension,u (mu) is the mass per unit length of the string, L is the length of the string and n is integer (1,2,3,4 ...) When n=1 this is known as the fundamental frequency. Or likewise for a solid rod the equation is, Where the letters are the same as before but Y is youngs modulus a measure of the material strength and under that is the symbol for density Rho As to finding the the natural frequency of your body, it's bit more difficult Your body could be treated as a collection of different objects and then theoretically the fundamental frequency of your body would be the lowest common multiple of these objects fundamental frequncies. I have no idea whether or not any one has actually done this. You will find more on this topic at http://www.britannica.com/bcom/eb/article/5/0,5716,117555+20+109557 ,00.html

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