Dec 14, 2024 · The de Broglie wavelength of a macroscopic solid body gives you the uncertainty of its center of mass. You can check that by transforming the system into center of mass and reduced coordinates. This is a linear canonical transformation of the spatial coordinats, and the Schrödinger equation of non-relativistic QM is invariant under those.

Oct 31, 2010 · The macroscopic cross-section (Σ) has units of cm-1 is derived from the microscopic section according to Σ = N σ, where N is the atomic density of a particular nuclide. The reaction rate for a give interaction = Σ Φ, where Φ is the neutron flux. These forumla work well for average or thermal neutron energies.

Aug 13, 2020 · Quantum Mechanics seems to explain phenomenon happening on a microscopic scale, where measurements aren't definite and probability plays a role. Classical physics explain macroscopic phenomenon where measurements are definitive without probability of that event happening. Is it happening just...

Jul 19, 2019 · Quantum theory is widely thought to be a theory of the fundamental microscopic constituents of matter. It is supposed to tell us something about how matter behaves at the fundamental microscopic level, from which the classical macroscopic behavior should somehow emerge as an approximation based...

Jan 19, 2012 · Note that, when "macroscopic" objects such as buckyballs starts behaving and showing quantum properties (such as exhibiting interference behavior), the experiments had to be performed at extremely low temperature to make sure all the constituents of the buckyball are in "coherence" with each other. It isn't easy to do. And guess what?

Jan 15, 2020 · A composite object made of many atoms has a large mass hence a small de Broglie wavethength...and we know that recent experiments succeeded to obtain interference patterns even for such objects (for instance the C60 molecule). Did theoretician understood how a wavefunction with such a small...

Nov 23, 2004 · No one is saying that GR is only a macroscopic theory, just that on the microscopic scale quantum effects become significant and also have to be taken into account. Of course the macroscopic scope of GR becomes microscopic in the earliest stages of the Big Bang and so it then becomes imperative to have an integrated quantum gravity to find out ...

Jul 12, 2013 · macroscopic cross section=1/mean free path for water 1-cos(theta)=0.324 and 0.116 for heavy water Its not right to use theta in thermal energy because in thermal area of energy scattering is isotropic!

Dec 1, 2015 · what will be the scenario if Heisenberg's uncertainty principle is applied at macroscopic level? Insights Blog -- Browse All Articles -- Physics Articles Physics Tutorials Physics Guides Physics FAQ Math Articles Math Tutorials Math Guides Math FAQ Education Articles Education Guides Bio/Chem Articles Technology Guides Computer Science Tutorials

Jul 16, 2020 · All the H-theorem says is, that if you consider only a coarse-grained picture of the evolution of a closed system, i.e., look at a subset of "relevant" macroscopic observables as an average/sum over many microscopic observables (e.g., some body consisting of ##10^{23}## molecules is described by its center of mass and the total momentum only ...