06-October-2008, 07:09 AM
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Junior Member
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Join Date: Jul 2008
Location: Singapore, atop a 'Artocarpus kemando'
Posts: 43
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IMHO, you can measure the "velocity" AND the location, but just that it's not precise.
Quote:
In quantum mechanics, the particle is described by a wave. The position is where the wave is concentrated and the momentum, a measure of the velocity, is the wavelength. Neither the position nor the velocity is precisely defined; the position is uncertain to the degree that the wave is spread out, and the momentum is uncertain to the degree that the wavelength is ill-defined.
The only kind of wave with a definite position is concentrated at one point, and such a wave has no wavelength. Conversely, the only kind of wave with a definite wavelength is an infinite regular periodic oscillation over all space, which has no definite position. So in quantum mechanics, there are no states which describe a particle with both a definite position and a definite momentum. The narrower the probability distribution is for the position, the wider it is in momentum.
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See here and here.
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Regards,
RegisteredUsername
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