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For example，the microstate of 1 m^3 volume helium of 300K go through in 1 s?I try to calculate the volume of diffusion in phase space but have no idea...
Asked on 06/20/2021 by kikyou
1 answerAs an example of Noether's Theorem, my QFT textbook gave the example of how the conservation of momentum and energy arises from symmetry in space-time translations. The book arrives at...
Asked on 06/20/2021
1 answerMy text book says "electrons of the same spin in degenerate orbitals tend to exchange their positions and this leads to stability". Firstly, why should the electrons exchange their positions?...
Asked on 06/20/2021
0 answerIn pseudo-Riemannian geometry we can derive the II. Bianchi identities by considering, e.g. the expression of the Riemann tensor in Riemann normal coordinates. They...
Asked on 06/20/2021 by Void
0 answerI understood that the covariant derivative of a vector field is$$nabla_{i}v^j=frac{partial v^j}{partial u^{i}}+Gamma^j_{~ik}v^k$$Then why is the covariant derivative of a covector field$$nabla_{i}v_j=frac{partial...
Asked on 06/20/2021 by Fuzzy
2 answerI was wondering if there was a difference between velocity of the center of mass of an object vs finding the velocity of an object in general. The case I...
Asked on 06/20/2021 by Nolikecoffee
1 answerA physical system that follows the Bragg law of diffraction, for example an electron scatter, shows interference patterns at some angle that follows the equation $nλ = 2dsin(θ).$ Usually...
Asked on 06/20/2021 by Pablo Diez Silva
0 answerFirst time poster here so I hope I'm not missing anything. The question "Consider a simple, lattice model for a polymer. In this model, the polymer sits on a square...
Asked on 06/20/2021 by GeekingGeek
0 answerA block lying on a rough surface, is connected to a wall by a mass less, inextensible string and an unknown amount of force is applied to the block opposite...
Asked on 06/20/2021
2 answerI've been trying to understand IQHE by reading these lecture notes by David Tong. Mainly, I was trying to understand the quantized hall resistivity in...
Asked on 06/20/2021
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