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Physics : Recent Questions and Answers (Page 172)

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

If I live on a planet that is heavy enough, would the CMB get blue shifted to be in the visible spectrum?

If I live on a planet that is heavy enough, would the CMB get blue shifted enough in the atmosphere of this heavy planet, due to gravitational blue-shifting, that the...

Asked on 07/20/2021 by bubakazouba

2 answer

How is the collapse of the wave function explained through electron atom scattering?

I have learned from this answer/comments that people have put much effort into understanding how scattering of electrons on atoms could explain where, for example on a screen behind...

Asked on 07/20/2021

0 answer

How to measure a multipartite density matrix?

I consider the tensor product $H_1 otimes H_2$ for pairs of qubits.they are described by a 4*4 density matrix $rho$.Bob and Alice share them and measure...

Asked on 07/20/2021

0 answer

Electric field in a shell in asymmetric situation

Suppose there is a metallic shell having a uniform charge Q spread over it uniformly. Now we bring a charge Q1 near it.What is the field at the centre...

Asked on 07/20/2021 by Parth Bhardwaj

2 answer

Does the Abbe limit hold for a single lens?

Let us say I have a single (converging lens) could I use the Abbe diffraction limit (for a microscope) to find its resolution or do I have to...

Asked on 07/20/2021

1 answer

Average energy of an SHM

Why do we usually calculate the average potential or kinetic energy of a simple harmonic motion with respect to time, why not with respect to position? Why even calculate average...

Asked on 07/20/2021 by Arnab Chowdhury

1 answer

Relation between cohomology and the BRST operator

Given a manifold $M$, we may define the $p$th de Rham cohomology group $H^p(M)$ as the quotient, $$C^p(M) , / , Z^p(M)$$ where $C^p$ and $Z^p$ are the groups of...

Asked on 07/20/2021 by JamalS

1 answer

Why does a transformation on $p$ imply the inverse transformation on $q$ in phase space?

I'm reading A conceptual introduction to Hamiltonian Monte Carlo. On pages 30-31 it is stated that applying a transformation to the momentum p in phase space, implies...

Asked on 07/20/2021 by Willem

1 answer

Thermodynamic Beta and Inverse Temperature

Following on from my previous question: Exponential form of Boltzmann Distribution I am now trying to understand the relationship between the thermodynamic beta and the inverse temperature. Ignoring...

Asked on 07/20/2021 by Andrew Davidson

3 answer

Derive vector gradient in spherical coordinates from first principles

Trying to understand where the $frac{1}{r sin(theta)}$ and $1/r$ bits come in the definition of gradient. I've derived the spherical unit vectors but now I don't understand...

Asked on 07/20/2021 by Lucidnonsense

3 answer

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