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Physics : Recent Questions and Answers (Page 530)

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

Why does heat of reaction equal the change in enthalpy for chemical reactions?

Chemists say something like "amount of heat consumed for a chemical reaction equals the change in enthalpy" but I cannot understand why this is the case. Here is my argument:...

Asked on 02/27/2021

1 answer

Determine molar extinction coefficient from data set

How can you determine molar extinction coefficient from the graph of Transmittance vs Wavelength, where the solution concentration and thickness of cuvette are known and constant by using Beer-Lambert Law?...

Asked on 02/27/2021 by blue3lf

0 answer

What is the longest coherence length stimulated-emission beam demonstrated?

Originally I was going to put "laser" in the title, but didn't want to restrict wavelength (e.g. masers). I did put "beam" in the title, since there may be highly...

Asked on 02/26/2021

3 answer

Which of the following does not show any interference pattern? a) Soap bubble b) Excessively thin film c) A thick film d) Wedge Shaped film

Which of the following does not show any interference pattern?a) Soap bubble b) Excessively thin film c) A thick film d) Wedge Shaped film I saw that explanation (Answer:...

Asked on 02/26/2021 by user272506

0 answer

Expressing Feynman propagator with absolute value instead of Heaviside step function?

I recently saw an interesting paper: https://arxiv.org/abs/1912.13435, where the author wrote the Feynman propagator of free massless scalar field as$$D_F(x-x') = -iintlimits_{-infty}^infty frac{domega}{2pi} e^{-iomega...

Asked on 02/26/2021 by ielschany

0 answer

Conservation of momentum during mass accretion

From Wikipedia:Mass accretion The following derivation is for a body that is gaining mass (accretion). A body of time-varying mass $m$ moves at a velocity $mathbf{v}$ at an...

Asked on 02/26/2021 by Pranav K

4 answer

Relationship between the magnetic dipole of the electron and the polarisation of its radiation

When passing through a magnetic field, electrons are deflected sideways. This is the basis of the Lorentz force and all Hall effects. If this is done on a larger scale...

Asked on 02/26/2021

1 answer

What does the correlation function look like in first-order transition?

I know the correlation function for critical phenomena $$G(r)sim frac{1}{|r|^{d-2+eta}}$$ for $rll xi$ and $$G(r)sim e^{-|r|/xi}$$ for $rggxi$....

Asked on 02/26/2021

1 answer

Rotation Reference Change Transformation CRTBP Python

I have created the following script that will propagate the dynamics of the CRTBP set for the Earth-Moon system. I have the initial conditions set for a vertical Lyaponov orbit....

Asked on 02/26/2021 by John Shepard

0 answer

Can a trace function be represented as a Hilbert-Schmidt product with the density matrix?

Given a trace function, say the von Neumann entropy $S(rho) = - mathrm{tr}(rho log rho)$, can it be express as a matrix $M$ where $S(rho) = ...

Asked on 02/26/2021 by 2ub

1 answer

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