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Physics : Recent Questions and Answers (Page 286)

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

Deriving a simplified expression for geometrical structure factor

I am interested in deriving a simplified expression for the geometrical structure factor $F_{hkl}$ for the alloy $Cu_3Au$. At high temperatures, there is an order-disorder phase transition, but...

Asked on 06/04/2021 by o's1234

0 answer

What is the difference between the Method of Characteristics being formulated in terms of theta & alpha and theta & nu?

So I'm doing an MSc thesis involving the method of characteristics in rocket nozzles. My lecture notes have the MoC formulated such that the positive characteristics are defined as: C+...

Asked on 06/04/2021 by KuangGradeMark11

1 answer

Conversion of 1D charge density to 2D charge density via integration

I'm self-studying EM (using the third edition of Griffiths) and have a quick question. Problem 2.41 states:Find the electric field at a height $z$ above the center of a...

Asked on 06/04/2021 by Dr. Momo

2 answer

Why does the rotation axis of the Earth wobble over time?

I've learned recently that the rotation axis of Earth (axial tilt or obliquity) oscillates between 22.1 and 24.5 degrees. I would like to understand why does that happen. Having a...

Asked on 06/04/2021

1 answer

What is the position wavefunction of coherent states?

Consider a coherent state $|alpharangle$, $alphainmathbb C$. In the context of a quantum harmonic oscillator, this is defined as the eigenvector of...

Asked on 06/04/2021

2 answer

Products of 3- and 4-vectors: consistency of the metric signature

EDIT for clarification of question: Is it correct that the square of a 3-vector picks up a minus sign in the signature ${+---}$? If not, doesn't that mean...

Asked on 06/04/2021

2 answer

A Venn diagram for: (non-)locality, (non-)realism, (non-)contextuality, (non-)signalling, (dis-)entanglement

I recently asked a (yet-unanswered) question about the relationship between state-dependence and violations of realism. The more I read on the subject, the more I find myself digging deeper...

Asked on 06/04/2021

0 answer

Is background independence necessary for loop quantum gravity in itself, or only necessary to make LQG compatible with special relativity?

At first look the idea of particulate space in loop quantum gravity would seem to indicate a preferred frame or ether, but theorists have gone to great lengths to prove...

Asked on 06/04/2021

1 answer

If the equivalence principle is true, and gravity causes time dilation, why doesn't acceleration also cause time dilation?

I'm sure I must have something very confused but I'm just reading through SE questions and articles and this seems to be a contradiction. Until recently I had no problem...

Asked on 06/04/2021 by JeneralJames

2 answer

Conservation of Energy in Capillary Tube

The capillary action lets a liquid rise in a narrow tube to a certain height. In this, the liquid gains some potential energy. According to the Conservation of Energy, the...

Asked on 06/04/2021

1 answer

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