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What is the idea behind finding a set of commuting observables to lift the degeneracy in perturbation theory? I just started a course in quantum mechanics and I do not...
Asked on 12/07/2020
1 answerWhen reading how the Drude plasma frequency affects the conductivity of a material to THz waves (in this case a Si modulator) I am told that: "In...
Asked on 12/07/2020
0 answerGiven a photon gas, one can use standard statistical mechanics methods to obtain the energy$$U=aVT^4,$$with $a$ a messy constant whose precise details do not matter. This...
Asked on 12/07/2020 by ahaha
0 answerIn collider experiments usually heavier and heavier mass resonances of particles are searched for. Examples: production of W and Z bosons at CERN $Spoverline{p}S$ or production of the Higgs...
Asked on 12/07/2020 by Antonio19932806
2 answerFor context, I am reading this paper. Basically, the paper makes reference to "evolving with respect to the time-reversed Hamiltonian". I'm slightly unclear as to what this...
Asked on 12/07/2020 by Jack Ceroni
1 answerConsider the wave equation in 1 spatial dimension (in units where $c=1$)$$frac{partial^2 u(t,x)}{partial t^2} - frac{partial^2 u(t,x)}{partial x^2} = 0 .$$Now suppose that...
Asked on 12/07/2020 by QuantumEyedea
1 answerThere are different modes present in a multimeter. one isthe current mode and voltage mode for their respective measurements. whatwill happen if one try to take a voltage...
Asked on 12/07/2020 by user272860
2 answerIn a multi-phase system with a liquid which meets a gas at the free surface, one can define liquid-vapour surface tension $gamma_{LV}$: is this surface tension a constant when...
Asked on 12/07/2020
1 answerObject A is located on the floor at the equator.Is that the magnitude of the normal force on A equal to its weight? How to obtain an expression for...
Asked on 12/07/2020 by sad9jai
1 answerThe Hamiltonian of a three-dimensional electron gas in a static magnetic field $vec{B}$ is :$$hat{H}=frac{(hat{vec{p}}+ehat{vec{A}})^2}{2m}$$ If choosing $vec{B}=Bvec{e_z}$ and using Landau gauge : $vec{A}=(0,Bx,0)$, we...
Asked on 12/07/2020 by Bellowo
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