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Physics : Recent Questions and Answers (Page 97)

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

Cold neutrinos - how are they distributed?

Cold or slow neutrinos have non-relativistic velocities and hence very low energies. That makes them very difficult to detect. Answers to Where are all the slow neutrinos? make it...

Asked on 08/23/2021

2 answer

Will magnets lose strength over time when coupled to another magnet?

Will magnets lose strength over time when coupled to another magnet ? Im designing a part (c. 200g) which needs to be held in place, but also be removable, so...

Asked on 08/23/2021

3 answer

Formulation of strong nuclear forces spin-dependent-term in larger nuclei

The nuclear force spin dependence term of deuterium is easy to explain, its was explained before in this site in question 288357. But what about larger nuclei with higher...

Asked on 08/23/2021

0 answer

How is Schwinger's quantum action principle related to least action?

The principle of least action says that a body moves in such a way that the action value $S=int L dt$ is stationary (often minimal). The...

Asked on 08/23/2021

1 answer

Acoustic transmission through walls

I am looking to understand the equation and physics of audio transmission through walls. I wish to model the indoors transmission of sound between rooms and I wish for any...

Asked on 08/23/2021

2 answer

To what precision is the heat capacity an extensive quantity

We know that heat capacity is an extensive quantity, basically meaning for double the amount of substance you need double the energy to increase temperature. To what extend is this...

Asked on 08/23/2021

3 answer

Understanding ground state expectation values of time ordered products of operators

Working through chapters 6 through 8 in Srednicki's "quantum field theory", I am having some trouble conceptually understanding what is happening when we take time ordered products of operators in...

Asked on 08/23/2021

1 answer

Geometric representations of affine Lie algebras

I have recently been reading literature on geometric constructions of representations of affine Lie algebras by Nakajima and others. In particular, the representations arise as cohomologies of moduli...

Asked on 08/23/2021

1 answer

Meissner Effect and Lorentz Force Paradox?

The Meissner effect expels magnetic field lines in a super conductor, see the picture below. Left is normal conducting, right is the superconducting state. ...

Asked on 08/23/2021

1 answer

Why is the Planck length considered fundamental, but not the Planck mass?

The planck length is considered by many to be a lower bound of the scale where new physics should appear to account for quantum gravity.The reasoning behind, as far...

Asked on 08/23/2021

3 answer

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