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This can be summed up through the photoelectric effect. An electron does not usually have enough energy to move up quantum states and orbitals on its own. It has to somehow be given the energy to do so, which we can observe directly through the experiment. The light gives energy to the electron and excites it to move up a quantum number, for example, from n=1, to n=2. However, the speed/ velocity cannot be tracked at the same time as its position, which is why the orbitals indicate a general area of the electron, and not an exact x value. This can be attributed to the particle AND wave-like properties of an electron.
Because an electron is extremely small, if you measure its position by using light (a photon), the photon will collide with the electron and thus, you will know its velocity but the position of the electron will not be certain because it may have had change direction after the measurement of its velocity was taken.
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