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Physics : Recent Questions and Answers (Page 806)

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

Formula for flux of electrons in 1D from carrier density profile

This content was taken from https://ecee.colorado.edu/~bart/book/contents.htm.In that they derive the diffusion current expression from this particular carrier...

Asked on 11/02/2020 by K Sreerag

1 answer

How does a knife cut things at the atomic level?

As the title says. It is common sense that sharp things cut, but how do they work at the atomical level? ...

Asked on 10/31/2020 by wtoh

3 answer

Size of the fermi surface of hole and electrons

The image below shows the shape of a fermi surface of Cr metal measured by Angle resolved photo emission spectroscopy. (not important) Question is why does the fermi surface shrinks...

Asked on 10/31/2020 by el psy Congroo

1 answer

Law of corresponding states (equation expansion)

I was reading Cambridge lecture notes on Statistical physics, and I came across this equation where they used some technique of expansion which honestly I couldn't understand how. So my...

Asked on 10/31/2020 by Marouane Elouali

0 answer

Can one body push another body away by sending gravitational waves towards it?

In the weak field limit, gravitational radiation can be treated by the linearized theory and then its properties are very much like those of electromagnetic radiation, except we are dealing...

Asked on 10/31/2020 by Andrew Steane

2 answer

Why can't an insulator let electricity pass?

I have read about this: Essentially in an insulators there is a big energy gap between the (valence) and the conduction band which is why there aren't many free...

Asked on 10/30/2020 by Faheem Azeemi

2 answer

Current induced by permanent magnet moving along toroid coil

(It's not really shown in the pictures, but please assume that the coils are included in a closed circuit in both configurations. Maybe they could serve as a tension source...

Asked on 10/30/2020 by Gabel Luc

1 answer

Landau-Lifshitz Equation of Motion for Triangular Heisenberg Antiferromagnet

There is a paper (PhysRevB.95.014435) in which the dispersion relation for some Heisenberg model on the honeycomb lattice is derived from the Landau-Lifshitz equation:begin{align}frac{d S_i}{dt} = -...

Asked on 10/30/2020 by Leviathan

0 answer

What is the difference between Larmor diamagnetism and Landau diamagnetism?

I have a rough idea, but would like a more precise distinction....

Asked on 10/30/2020 by TheoreticalMinimum

0 answer

Derivation of Snell's Law

I am following an example in the book "Electromagnetic Waves and Antennas" by S. Orfanidis. He has two planes waves incident on both sides of a boundary. Here, $k_{pm}...

Asked on 10/30/2020 by pmac

1 answer

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