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We are in vacuum and have a non magnetic material of which we want to determine the frequency dependence of the complex susceptibility with nothing than the power reflectivity. How...
Asked on 08/23/2020
0 answerIn both classical and quantum physics Lagrangians play a very important role. In classical physics, paths that extremize the action $S$ are the solutions of the Euler-Lagrange equations, and...
Asked on 08/23/2020 by Ignacio
2 answerI have read that from the fluctuation-dissipation theorem that the heat capacity is proportional to energy fluctuations (or populations fluctuations). In this context what is the meaning of 'energy fluctuations'...
Asked on 08/22/2020
1 answerHow does the diffraction of sound waves differ from the diffraction of EM waves? EM waves have their electric field vector point in a direction perpendicular to the direction of...
Asked on 08/22/2020 by FourierFlux
1 answeri have UVC led with 270nm wavelength and output power of 70mW. The total length of the passage for the de-contamination is 40cm and the total time is 60 seconds....
Asked on 08/22/2020 by Physical
0 answerBy definition from Wikipedia, the beam splitter (BS) operation $U_{BS} = begin{pmatrix} t & r r & t end{pmatrix} = begin{pmatrix} costheta & -isintheta...
Asked on 08/21/2020
1 answerWhen I explain QM to non-physicists, I sometimes say that quantum effects are typically noticeable on very small scales. For example, a QM particle in the harmonic potential behaves mostly...
Asked on 08/21/2020
1 answerI understand why fission generates large amounts of energy when the nucleus is split, but then why does fusion generate such large amounts of energy. If fission releases energy when...
Asked on 08/21/2020
2 answerIf I have a charge $Q$ located over a 2 layer dielectric as represented: According to the image method: the charge ...
Asked on 08/21/2020 by Anthony Lethuillier
1 answerConsider the interacting field Lagrangian density of the real KG fieldbegin{equation}mathscr{L}=frac{1}{2}partial_muphipartial^muphi-frac{m^2}{2}phi^2-frac{lambda}{4!}phi^4end{equation}The generating functional for the theory isbegin{equation}W[J]=intmathscr{D}phi(x)expleft(iint d^4xleft[frac{1}{2}partial_muphipartial^muphi-frac{m^2}{2}phi^2-frac{lambda}{4!}phi^4+Jphi right]right)end{equation}the surface terms...
Asked on 08/21/2020
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