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The dispersion for the 1d chain of harmonic oscillators is $nu = sqrt{frac{alpha}{m}} frac{|sin(pi k d)|}{pi}$ Where I'm explicitly not using angular frequencies ($nu = frac{1}{T}, k =...
Asked on 05/14/2021
1 answerThe reason why you have to tune differently the atomic clocks in GPS is because the GPS is higher or because there is less gravity there, or both? In other...
Asked on 05/14/2021
4 answerLet's take water for example. How can we calculate the heat (enthalpy) of vaporization from first principles? The enthalpy of vaporization $ Delta H_v$ is $$ Delta H_v...
Asked on 05/14/2021
0 answerWe tend to rub soap after applying it to the skin. I found it interesting that the mere act of sliding our hands on the wet skin surface produces millions...
Asked on 05/14/2021 by AlphaLife
5 answerMy textbook (Arthur Beiser Intro to Modern Physics) states that "unbound low-energy electrons can travel freely through a crystal since their waves are long relative to the lattice spacing ...
Asked on 05/14/2021
0 answerI have learned two ways of representing Feynman Propagator, which are as follows: The first method is to represent it in the form of commutation relations:...
Asked on 05/14/2021 by Little Physicist
0 answerEverywhere I see it is quoted that when an object is at C its reflected image by a concave mirror will also be at C (and be inverted and equal-sized),...
Asked on 05/14/2021
1 answerIf I have an open tap such that there is a continuous stream of water falling through height $h$, is the flow rate the same at every point on...
Asked on 05/13/2021 by Blue5000
5 answerSo, in doing some numerical computations in QFT, I've run into the following Wigner $6j$-Symbol: $$left{begin{array}{ccc} x & J_1 & J_2...
Asked on 05/13/2021 by Mesoscopic C
2 answerProblem SettingWhen we solve both the KG equation and the Dirac equation, there is the need to introduce negative energy solutions in order to have a complete set of states....
Asked on 05/13/2021 by HyperThickStructure
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