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Does energy and momentum also dilate and contract as time and length do respectively, since energy and time and momentum and length are complementary quantities both in relativity & QM?...
Asked on 12/29/2020 by rim
2 answerFrom what I have studied so far, under forward bias the pn junction's depletion layer and barrier potential are reduced. Then there is something called threshold voltage that keeps coming...
Asked on 12/29/2020 by Aditya Prakash
0 answerWhat is the definition of slow-roll parameter? What equation that these parameters are showed up? I read a book "Modern Cosmology" by Scott Dodelson. In chapter 6, it is just...
Asked on 12/29/2020
0 answerI am trying to understand how to build the spectrum of the angular momentum; of course since different components of the angular momentum do not commute with each other we...
Asked on 12/29/2020
1 answerThe Green's function for the 2D Helmholtz equation satisfies the following equation: $$(nabla^2+k_0^2+mathrm{i}eta),{mathsf{G}}_{2mathrm{D}}(mathbf{r}-mathbf{r}',k_o)=delta^{(2)}(mathbf{r}-mathbf{r}').$$ By Fourier transforming the Green's function and using the plane wave representation for the Dirac-delta function,...
Asked on 12/29/2020 by Curiosity
1 answerIf an object falls and hit the ground with a force, the ground also pushes it back because of third law of motion but from where does the force coming...
Asked on 12/29/2020 by Ashutosh Kumar
2 answerIt is theorized that during inflation gravitational waves are produced. See this article by Guzzetti, Bartolo, Liguori, and Matarrese (Cornell University). Or this one...
Asked on 12/29/2020
1 answerConsider the first law of thermodynamics, $$ dU = dq +dw$$ simplfying, $$ dU + P_{text{ext}} dV = dq$$ Now we can say that $ q $...
Asked on 12/29/2020
1 answerI have some problems understanding the symmetry of spatial wave functions. In my experimental physics course they tought us that in atoms the total wave function $Psi_{tot}(vec{r}_1,vec{r}_2)=Psi(vec{r}_1,vec{r}_2)chi(S,M_s)$ has to...
Asked on 12/29/2020 by Mister00X
3 answerThe actual number: How far apart are galaxies on average? An attempt to visualize such a thing: If galaxies were the size of peas, how many would be in...
Asked on 12/29/2020 by user12345
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