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Physics : Recent Questions and Answers (Page 829)

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

Relating Fock states to eigenfunctions in space domain

How can I relate the eigenvalues of $H=hbaromega(a^dagger a+1/2)$ to the eigenfunctions of $H=frac{p^2}{2m}+frac{1}{2}momega^2 x^2$, with $p=-ihbarnabla$? I mean, how the analytical approach to the solution of...

Asked on 09/12/2020

1 answer

What happens to gravity and spacetime when mass turns to energy?

What will happen to the distorted space and time around a mass when it is converted into energy? Will it go back to its original configuration (i.e. with $0$...

Asked on 09/12/2020

3 answer

How is motional EMF developed?

According to my textbook and several other sources on the internet if we we move a rod in the direction perpendicular to a uniform magnetic field, the electrons will also...

Asked on 09/12/2020 by Batwayne

2 answer

Flow rate of gas down a pipe at low pressures

I'm trying to understand an 'approximate derivation' of the flow rate of gas down a pipe at low pressure from my book (an example problem). It uses the result that...

Asked on 09/12/2020 by Watw

1 answer

How to compute the composition of 2 gravitational time dilations?

This question could apply to stars orbiting a black hole, or planets orbiting a star, or moons orbiting a planet. The example numbers don't matter, just the concept. Lets...

Asked on 09/12/2020 by foolishmuse

2 answer

Double Potential Well (Hubbard Model)

The Hamiltonian from the Hubbard model for the double well potential $V(x) = V_0 frac{x^2 - q^2}{q^2}$ is given bybegin{equation}H = -J(a_L^dagger a_R + a_R^dagger...

Asked on 09/11/2020 by LarrytheLobster

1 answer

In the photoelectric effect, what happens to the electron if the work function is too low?

I know that no electrons will be emitted from the atom if the threshold is not reached, but my professor is asking us what happens to an electron in this...

Asked on 09/11/2020 by Molly Lynn

1 answer

A problem with the "Voigt transformation"

In the traditional Lorentz transformation when we derive unprimed variables in terms of the primed ones, and vice versa, we see that there is no change in the corresponding equations...

Asked on 09/11/2020 by Mohammad Javanshiry

0 answer

Is there a meaning to $mathrm{e}^{H(p_{i})}$ or $2^{H(p_{i})}$?

In my research I find an equation featuring the "exponential entropy" term $mathrm{e}^{H(p_{i})}$ and I wonder if it has a specific meaning. I have only found rare references to...

Asked on 09/11/2020 by frencho

1 answer

Question about lowest rung on Harmonic Oscillator

I'm reading Griffiths's Introduction to Quantum Mechanics 3rd ed textbook [1]. On p.43, the author explains:What if I apply the lowering operator repeatedly? Eventually I’m going to reacha state...

Asked on 09/10/2020 by An Epsilon of Room

2 answer

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