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Physics : Recent Questions and Answers (Page 246)

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

What error to use on measurement?

I have a question regarding errors which has always stumped me. It's what error should be quoted on a measurement. Let's say I have a very simple situation with a...

Asked on 06/21/2021 by Harry Spratt

1 answer

Do we have to treat ideal gas as identical particle?

In Quantum Mechanics 2nd edition by Griffiths, he says we can get Maxwell-Boltzmann distribution as we deal with distinguishable particles. And I think ideal gas follows MB distribution; therefore, I...

Asked on 06/21/2021 by Harry Shieh

0 answer

Why the volume of a cell in phase space should be equal to $(2pi hbar)^s$?

We want to properly define the concept of entropy using the Boltzmann's Definition of it. But there is a big problem: the coarse graining...

Asked on 06/21/2021

0 answer

Effective one-particle hamiltonian from many-body Green function

Consider a many-body Green function in terms of localized orbitals, $G_{mu nu}(omega).$ The underlying hamiltonian is something like (I will write it with a great generality and omitting spin,...

Asked on 06/21/2021

0 answer

Four velocity, time component

I am having a little trouble to understand how do we find the time component of the four velocity of a particle in a Schwarzschild metric space, in its rest...

Asked on 06/21/2021

0 answer

Thermodynamics Potentials Relations

I tried to find the whole connections between the thermodynamics potentials without any success,the main potentials $U,F,G,H$ and the relations between them (derivatives), for an example what is...

Asked on 06/21/2021 by Aren Kakoly

1 answer

Difference between coherent scattering and elastic scattering

What is the difference between coherent and elastic scattering? Maybe the elastic scattering implies that there is no loss of energy, whereas the coherent scattering implies that the wavelength of...

Asked on 06/21/2021

3 answer

Why we cannot use Gauss's Law to find the Electric Field of a finite charged sheet?

I could not understand why we can't use Gauss's Law to find the Electric Field of a finite charged sheet?...

Asked on 06/21/2021 by Majd Ramadan

1 answer

Is the center of the supergiant star a white dwarf?

According to An Introduction to Modern Astrophysics, there is a sentence in the book that describes a white dwarf at...

Asked on 06/21/2021

0 answer

Explanation for concept of relative density

I am in class $9^{th}$, I'm reading my physics book in which it is written that: $$mathrm{Relative Density} = frac{mathrm{Weight of solid in air}}{mathrm{Loss of weight of solid in water}}$$...

Asked on 06/20/2021 by mnulb

2 answer

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