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Quantum mechanics - Wikipedia, the free encyclopedia |
 | | However, if we restrict the particle to a region of space (the so-called "particle in a box" problem), the momentum observable will become discrete; it will only take on the values |
 | | , where L is the length of the box, h is Planck's constant, and n is an arbitrary nonnegative integer number. |
 | | Such observables are said to be quantized, and they play an important role in many physical systems. |
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