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Suppose we have $N$ spin-1/2 particles and let $vec{S} = frac{hbar}{2}sum_{n=1}^Nvec{sigma_n}$ be the total spin vector operator, with $vec{sigma}_n = (sigma_n^x,sigma_n^y,sigma_n^z)$ the Pauli spin matrices of the...
Asked on 06/21/2021
2 answerIn Feynman's book on statistical mechanics, he stated that sound cannot propagate in a collisionless electron gas. It is on page 245. I do not fully understand his argument. We...
Asked on 06/21/2021
0 answerI read that an object at rest has such a stupendous amount of energy, $E=mc^2$ because it's effectively in motion through space-time at the speed of light and it's traveling...
Asked on 06/21/2021 by ODP
6 answerI don't understand how did Planck solve the black body problem by the quantization of energy. My questionsWhat will the oscillators/atoms do with the energy that is not an integral...
Asked on 06/21/2021
0 answerDoes QM explain the fact that in nature electrons in atoms tend to be in the lowest energy level? Why are excited states unstable? And are excited states always more...
Asked on 06/21/2021
2 answerOn this interactive table of nuclides, there is a region just "north east" of $^{208}text{Pb}$ and $^{209}text{Bi}$ with extremely unstable nuclides (the yellow/pink/light green squares)....
Asked on 06/21/2021 by pr1268
1 answerI know that at the ends of a long solenoid induced magnetic field is $B= (μ_0NI)/2$. This is found by either integration or considering it as a part of...
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0 answerWhen the two waves collide, why do they pass right through each other? Mathematically it's due to the principle of superposition: the sum of the two solutions of a wave...
Asked on 06/21/2021 by zngr
2 answerTextbooks and websites say:A magnetic needle rests making different angles with horizontal when suspended at different places of the earthIn the explanation, they say that the magnetic needle becomes vertical...
Asked on 06/21/2021 by WebDevLearner
1 answerNormally, the affine connections are objects that define parallel transport. In general Relativity they are the Christoffel symbols of the second kind. Consequently, they depend on the metric tensor. Is...
Asked on 06/21/2021 by Koustubh Kabe
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