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Solids don't exert pressure on their surroundings. Gasses and liquids do. A pressure meter inside a solid won't register pressure. A pressure meter inside a liquid or gas will.What...
Asked on 05/27/2021
1 answerSuppose we have a fermion lagrangianbegin{equation}mathcal{L}=bar{psi}igamma^{mu}partial_{mu}psi-mbar{psi}psi,end{equation}which can be written in terms of $psi_{L,R}$ and $bar{psi}_{L,R}$begin{equation}mathcal{L}=bar{psi}_Ligamma^{mu}partial_{mu}psi_L+bar{psi}_Rigamma^{mu}partial_{mu}psi_R-m(bar{psi}_Lpsi_R+bar{psi}_Rpsi_L).end{equation} So how should I...
Asked on 05/27/2021
0 answerI'm having some trouble with this part of Sakurai's derivation of the time evolution operator in QM (page 70):Because of continuity, the infinitesimal time-evolution operator must reduce to the identity...
Asked on 05/27/2021 by soupdragon
2 answerImagine we've got two massless particles in an otherwise empty Newtonian world, both at the same position, with zero velocity in t0. One is without acceleration, but the other has...
Asked on 05/27/2021 by Âloh
2 answerIn atom, electron changes orbital by absorbing and releasing energy.Electrons can suddenly jump when energy is high but my question is: does actual path exist or not?And perhaps...
Asked on 05/27/2021 by Priyanshu Saurabh
1 answerA long time since I posted it, still did not get a satisfactory solution. So I restate the problem - Why does not an object attached to a string which...
Asked on 05/27/2021
6 answerI understand how the torque depends on the number of turns as $$ tau = NiAB sin{theta} $$ where $tau$ is the torque, $N$ the number of...
Asked on 05/27/2021
1 answerAfter reading some question-answers about the term "macrostate" I am still confused.Macrostate of a thermodynamic system is generally defined as set of values of macroscopic state variables like P,...
Asked on 05/27/2021
1 answerCan someone help me understand how the phase angle difference is just the dot product of k and r? Also, how do we get that the difference in phase angle...
Asked on 05/27/2021 by Ba Lalo
1 answerXY is a straight wire carrying current I. Every point on XY will form magnetic field...
Asked on 05/27/2021
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