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What are Gaussian spherical waves? and Is it necessary for a Gaussian spherical wave to be a laser beam? I found the term in the paper Opt....
Asked on 05/26/2021
1 answerUsing an ammeter between the wall and signal generator, I noticed that when the lead from a single channel is attached to the signal generator, the power into the signal...
Asked on 05/26/2021 by Bruce-TPU
2 answerI am having problems to compute explicitly averages of quartic terms, like $langle a_{mathbf{p}}^dagger a_{mathbf{q}} a_{mathbf{r}}^dagger a_{mathbf{s}}rangle$. The subscripts are linear momenta. The system has $N$...
Asked on 05/26/2021
0 answerWhile thinking about Will "water" glow at very high temperatures? it made me realize another gap in my understanding of physics/chemistry. To mean these two things seem paradoxical:if you...
Asked on 05/26/2021
2 answerConsider a canonical transformation $(p,q) rightarrow (P,Q)$ under a generating function $F$. The condition for form invariance of Hamiltonian equations of motion looks like :$$sum_{s}P_sdot{Q_s} - H' = sum_{s,r}(frac{partial{q_s}}{partial{Q_r}}dot{Q_r}...
Asked on 05/26/2021 by user35038
1 answerThe graph of Fermi-Dirac distribution near absolute zero and an electrical filter looks very similar. My question is does: this similarity finds any application? I can't think...
Asked on 05/26/2021
0 answerSo this is from Griffiths particle physics book about pion decaying into neutrino and muon. The part I have problem with is that it states ``` begin{equation}p_{pi}^2=m_{pi}^2c^2 ,...
Asked on 05/26/2021 by Physics21
4 answerI have this problem involving conduction of heat:Suppose that $z = 0$ represents the ground level on a street where anelectric cable is buried at $x =...
Asked on 05/26/2021
1 answerI've skimmed articles/blogs and watched videos around this issue, and the universal consensus is that dark matter and dark energy are two different things >> DM is attractive while DE...
Asked on 05/26/2021
2 answerI was watching minuteEarth's video on Young-Laplace with regards to RDS in premature babies when I made the connection that bread dough, as a foam with many curved pockets of...
Asked on 05/26/2021
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