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**Physics, Astronomy & Cosmology / Re: What happens when both slits are observed by in the double slit experiment?**

« **on:**09/11/2019 07:37:47 »

QM theory says no amount of measuring of a system will allow you to predict it.Be careful how you state this. The test of quantum mechanics is not merely that it explains obvious quantum phenomena like line spectra, but that it scales to classical mechanics for large assemblies. And it does.

The wave function of a billiard ball is negligible in comparison with its apparent diameter, so for all practical purposes (e.g. potting the black) it is adequately predictable. But its structure, mass and elasticity are all calculable from quantum mechanics.

Indeed the "measuring" test isn't fundamental to QM. The classical model of bouncing a photon off an electron sort of illustrates the problem of measurement influencing the measurand, but masks the

*inherent*indeterminacy of Heisenberg's statement that Δp.Δx ≥ h.

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