Physics Questions, Problems & Solutions : TransWikia.com ~ Page 145

Gravitational field from virtual photons; does $rho c^2 = frac{1}{2} epsilon_0 |E|^2$?

Answers to Is energy localised in space? got me thinking about answer(s) to Sun constantly converts mass into energy, will this cause its gravity to decrease? and the...

Asked on 08/01/2021

2 answer

Why do two different methods to calculate the path difference yield different results?

HCV Concepts(Physics) 17.26 Note that $Delta$ means triangle Consider a point source of light S, which sends two rays of light of wavelength $lambda$ (order of magnitude ...

Asked on 08/01/2021 by Meripadhai

1 answer

Is the speed of an air bubble in a fluid equal to the fluid's speed?

The liquid (water) in a closed pipe system is pumped around. There are some air bubbles in the system. Do the air bubbles travel with the same speed as the...

Asked on 08/01/2021 by Abdel Aleem

2 answer

Building eigenfunctions from eigenkets

Suppose I have a wavefunction into which I insert the completeness relation of some discrete basis as $$ psi_alpha(x)=langle x|alpharangle=sum_k langle x|a_kranglelangle a_k|alpharangle=sum_k u_k(x) c_k~~. $$...

Asked on 08/01/2021

2 answer

Conservation of momentum and translation symmetry

Physics laws should not be changed under translations, so the Hamiltonian must commute with the generator of translations, which is the momentum operator, that is $[H,P]=0$. However we know...

Asked on 08/01/2021 by GK1202

3 answer

Heisenberg Hamiltonian matrix and subspaces

I'm dealing with a 4-site Heisenberg's model with no external field: $$begin{align*}H = sum_{i<j=0}^3h_{ij}, quad where h_{ij} equiv J_{ij}(vec{sigma_i}cdotvec{sigma_j}) = J_{ij}(X_iotimes X_j+Y_iotimes Y_j+Z_iotimes Z_j)end{align*}$$ The...

Asked on 07/31/2021

1 answer

Any suggestion for a DFT software package for a beginner?

I would like to do start doing some basic calculations using DFT. I am interested in solid state physics of strongly correlated materials in 3d or 2d. I prefer free...

Asked on 07/31/2021 by sintetico

0 answer

Can we say that iron on heating is a fluid?

When iron is being put on fire, its forces with other atoms starts to break. We know a solid has more atoms and less spaces between them while liquids have...

Asked on 07/31/2021

4 answer

Microcanonical ensemble question

I just started studying statistical mechanics and I'm doing a multiple choice quiz but I'm confused about one (well, two) questions in particular. The main one is the following: "A...

Asked on 07/31/2021 by user328183

1 answer

Does GR being locally Lorentz imply having to consider spinor irreps ($SL(2,mathbb{C})$) for consistence with its curved manifold tensor structure?

Even if not with the specific purpose of dealing with spinorial matter (like in supergravity, gauge formalisms, etc), does the mathematical consistence of GR entail that in a local (Lorentz)...

Asked on 07/31/2021 by Adolf White

0 answer

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