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Physics : Recent Questions and Answers (Page 326)

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

Wavelength and penetration by EM radiation

I'd like you to clarify the relationship which relates penetration power by EM radiation with its wavelength (or inverse of frequency). Suppose we conduct an experiment, irradiating a body with...

Asked on 05/19/2021 by MadHatter

3 answer

Why does soap make water feel colder?

Whenever I wash my hands I feel like the water gets colder after I use soap. As an experiment, I soaped up just one hand and washed them both under...

Asked on 05/19/2021 by Hovercouch

0 answer

How to prove that Faddeev-Popov ghosts are unnecessary for Yang-Mills theory with axial gauge?

In the book it says that in Yang-Mills theory with axial gauge: $n_{mu}A^{mu}=0$ using Faddeev-Popov ghosts are needless. Does anyone know how to prove this?...

Asked on 05/19/2021 by user178466

3 answer

Realistic calculation of heat loss for pipe

Good day everyone, I am new on this site and I hope to find here help, since I am not going anywhere with the literature I have found. I try...

Asked on 05/19/2021 by user36510

4 answer

’t Hooft 1982 Phys. Scr. 25 133 on superconductivity

In G. ’t Hooft 1982 Phys. Scr. 25 133 paper 'The Topological Mechanism for Permanent Quark Confinement in a Non-Abelian Gauge Theory' He wrote in the abstract:We...

Asked on 05/19/2021

0 answer

Hooke's law for atom-to-atom energy well can't be right

Hooke's law says that the potential energy between two atoms is, $V(x)$, for two atoms with distance $r_1-r_0$ is $frac{1}{2}kx^2$. At room temperature and...

Asked on 05/19/2021 by asdfasdfasdf

2 answer

Calculating entropies from purified state

I am a bit stuck with the following problem and hope you can help me. Consider the density operator $$rho_{AB} = sum_{i=0}^{3} p_i |Phi_irangle langle Phi_i|$$ where $|Phi_irangle$...

Asked on 05/19/2021

1 answer

When can we neglect the effect of diode capacitance?

I was told that for DC and low-frequency AC circuits, the effect of diode capacitance can be neglected. The model of the diode of concern here is that which represents...

Asked on 05/19/2021 by epsilon-emperor

0 answer

What is $E$ in below equation? Does it represent total energy or kinetic energy(De-broglie equation for uncharged particle like neutron.)

De-broglie equation for uncharged particle:$$lambda= frac{h}{sqrt{2mE}}$$Where,$lambda$ = wavelength $h$ = planks constant $m$ = mass of uncharged particles...

Asked on 05/18/2021

2 answer

Looking for problem sets suitable to go with Physics from Symmetry

I'm reading through Physics from Symmetry by Jakob Schwitenberg - which is fantastic so far. I'm a math/physics undergrad on my last semester of lower division and this is a...

Asked on 05/18/2021

0 answer

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