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Physics : Recent Questions and Answers (Page 67)

Find answers to your questions about Physics or help others by answering their Physics questions.

How does effective potential reduce a two variable problem into a single one?

https://en.wikipedia.org/wiki/Effective_potential In this wiki link, They write $$ E = frac{1}{2} mv^2 + frac{1}{2} mr^2 omega^2 - frac{GMm}{r}$$ Then they sub $$ L=...

Asked on 09/05/2021

1 answer

How do topological insulators violate Nielsen-Ninomiya Theorem?

I am under the impression that topological insulators have a distinguishing characteristic where they have an odd number of Dirac points that intersect band gaps at the...

Asked on 09/05/2021 by Andrew Hardy

1 answer

Boundary condition for Schrödinger equation at metal-semiconductor interface

Suppose I want to solve the $1text{D}$, time-independent Schrödinger-equation for a metal-semiconductor junction. In the metal region $0 leq x leq x_{0} $ the Schrödinger equation reads: ...

Asked on 09/05/2021 by user13514

2 answer

Natural motion of objects according to Einstein

I was watching an introductory video on general relativity and it said that according to Einstein the natural state of any object is free-fall motion. All objects naturally move through...

Asked on 09/05/2021

4 answer

Grounded conducting sphere with cavity (method of images)

If I have a grounded conducting sphere with a cavity [radius $R$] that has a positive charge inside, using the image method to calculate the electric field I have...

Asked on 09/05/2021

1 answer

Book for a comprehensive (re-)introduction to physics in a single volume

Although I hold a masters degree in math, I always struggled with physics, and I was relieved when I didn't have to study it any more. Now that I have...

Asked on 09/05/2021 by user270852

1 answer

Bertrand's theorem and nearly-circular motion in a Yukawa potential

The question has arisen as a result of working on part b of problem 3.19 in Goldstein's Classical Mechanics book.A particle moves in a force field described by the Yukawa...

Asked on 09/05/2021

2 answer

The most general Hamiltonian of double group $T_d$

Consider the electron interaction Hamiltonian of the form$$H= sum A_{ijkl} c^dagger_{k_R,i} c^dagger_{k_L j} c_{k_L k} c_{k_R l}$$on $j=3/2$ states. The index $i,j,k,l$ denotes the value...

Asked on 09/05/2021

1 answer

On teleportation

I read about the teleportation in a simple explanation involving Alice and Bob. I understood the part where Alice and Bob are given one of the particle from an entangled...

Asked on 09/05/2021 by Proxy

1 answer

Force when rope becomes taut

Suppose there is a rope which is initially untaut, two people go and hold both ends of the rope and start running in opposite directions at constant velocity. Let...

Asked on 09/05/2021

3 answer

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