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Physics : Recent Questions and Answers (Page 156)

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

A question on dipole approximation

In the Feynman Lectures on Physics, Volume 2, Chapter 6, Section 6-4 Feynman derives the electric potential due to a sphere with a surface charge distribution proportional to the cosine...

Asked on 07/27/2021

1 answer

Chemical potential in semiconductor derivation

In deriving the density of electrons at the bottom of the valence band in a semiconductor, $$n(T) = int^infty_{epsilon_C} frac{g_c(epsilon)}{e^{beta(epsilon - mu)}+1}$$ we approximate the integral as $$n(T)...

Asked on 07/27/2021

1 answer

Law of refraction

In my textbook it is given that "The refractive index of a substance does not depend on the angle of incidence" ButRefreactive index =sine of angle of incidence/sine of...

Asked on 07/27/2021 by Harsh Gautam

3 answer

Will a shrinking universe have a reverse arrow of time?

I'm not a physicist so forgive me if this question is silly. I'm reading (actually listening) to Mysteries of Modern Physics: Time by Prof. Sean Carroll. ...

Asked on 07/27/2021 by Bolza

2 answer

Does gravity get stronger the higher up you are on a mountain?

So I saw this article stating that gravity is stronger on the top on the mountain due to there being more mass under you however I have read some questions...

Asked on 07/27/2021 by Bartlomiej Dlugosz

6 answer

Is there any instance where the microcanonical, canonical and grand canonical ensembles give equal results?

In certain circumstances; when energy fluctuation effects are minimal, the microcanonical and canonical ensembles give the same results. Then, under different circumstances the canonical and grand canonical ensembles give the...

Asked on 07/27/2021 by sendlokashun

1 answer

An infinitesmal transformation that is canonical

The following infinitesimal transformation of phase space coordinates (for infinitesimal $epsilon$) is apparently canonical (preserving Hamilton's equations and Poisson brackets): $$ q_i' = q_i + epsilon frac{partial g}{partial...

Asked on 07/27/2021

1 answer

Separation of Variables ( Conduction)

I am working on this separation of the variable problem, and given that this square conducting pipe of side length 2a, while also parallel to the z-axis. They give that:...

Asked on 07/27/2021 by Phantomvex

0 answer

Magnetic flux with two concentric cirular loops

Suppose I have two cocentric circular loops, one with radius $R_2$ and one with radius $R_1$ where $R_2$ is the radius of the larger loop. Current is...

Asked on 07/27/2021 by variations

1 answer

Sign error when deriving Weyl spinor transformation laws (3.37) in Peskin Schroesder

I am having some trouble deriving the transormation laws for the weyl spinors, equation (3.37) in the Peskin Schroesder book on quantum field theory. Beginning with the relation $psito(1-frac{i}{2}omega_{munu}S^{munu})psi$...

Asked on 07/27/2021

1 answer

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