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Physics : Recent Questions and Answers (Page 147)

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

How is the 4-momentum, especially the transverse momentum, in a detector calorimeter measured?

assuming a jet is produced in the detector at a hadron collider. Some of the jet particles are uncharged and will only interact with the hadronic calorimeter and therefore there...

Asked on 07/31/2021 by Kizame

1 answer

Is there a difference between Newtonian mechanics and classical mechanics?

I have heard the terms "Newtonian mechanics" and "classical mechanics" used interchangeably, but is there a difference between them? If so, what is it?...

Asked on 07/31/2021

2 answer

Some basic concepts in quantum field theory part 1

I have some problems about basic concepts of quantum field theory. First let's look at Klein-Gordon field. Klein-Gordon equation has two branches of solutions, one of which is positive frequency...

Asked on 07/31/2021

1 answer

Calculating the Franck-Condon Factors

I want to calculate the Frank-Condon Factors using the standard equation:$$q_{v'v''}=left[int psi_{v'}^* psi_{v''} drright]^2$$ I have the vibrational wave functions of $v'$ and $v''$ in...

Asked on 07/31/2021

0 answer

Recipe to determine symmetries of quadratic fermionic Hamiltonian in second quantisation

Consider an arbitrary 1D chain (of length $N$) of fermions with an arbitrary quadratic Hamiltonian of the form $$mathcal{H}=hat{Psi}^dagger H hat{Psi}$$ with $$hat{Psi}=left(a_1, a_2, ...,a_N,a_1^dagger, a_2^dagger,...

Asked on 07/31/2021

1 answer

Where does the $partial vec{E}/partial t$ term from Maxwell's equation go in Ampere's Law?

One of Maxwell's Equations (ME) is: $$nablatimesvec B = mu_0vec J+epsilon_0mu_0 frac{partial vec E}{partial t}.$$ While Ampere's Law (AL) is: $$nablatimesvec B = mu_0vec J.$$ Griffiths...

Asked on 07/31/2021 by F dot Floss

4 answer

Does Feynman refer to Planck's constant in his water wave thought experiment?

Excerpt from the Feynman Lectures, Volume III, Quantum Behavior:The instantaneous height of the water wave at the detector for the wave from hole 1 can be written...

Asked on 07/31/2021

0 answer

Quantum fields in infinite volume

This problem might sound a bit trivial at face value but to me is sorta hard to grasp if not paradoxical! We know that the energy gap between the quantum...

Asked on 07/31/2021

2 answer

Lorentz Transforming the electric field and the change of its directions

This is a two part question about the Lorentz transformation of the electromagnetic field, the electric field to specific. The Lorentz transformation will be a simple boost in the x...

Asked on 07/31/2021 by Raeed Mundow

1 answer

Can't make a good mental picture of the electric and magnetic fields of a single moving photon

In most physics textbooks, the oscillating electric and magnetic fields generated by a moving photon are depicted as above. In this...

Asked on 07/31/2021 by dionysus

1 answer

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