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Physics : Recent Questions and Answers (Page 305)

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

Drawing the Wavefunction

In lecture, my professor had drawn the wavefunction for a particle which encounters a potential energy barrier, whose energy it fails to exceed. The graph was highly similar to the...

Asked on 05/27/2021 by Vera Leighton

2 answer

Kinetic energy and curvature

In quantum mechanics, the kinetic energy of a particle described by the wave function $psi$, is related to the curvature of the $psi$. This is easily seen, but...

Asked on 05/27/2021 by PepsiCola

2 answer

What are some examples of moving a fluid without changing pressure?

Bernoulli's principle states that, in a steady, incompressible, inviscid flow, the sum of all forms of mechanical energy in a fluid along a streamline is the same at all points...

Asked on 05/27/2021

0 answer

Vertex correction in QED

I've been working through the chapters in Schwartz on the renormalisation of QED, and I have some confusion to do with the form of the Vertex correction. By my understanding,...

Asked on 05/27/2021 by Edbroad123

2 answer

Einstein's Field Equations differ by a factor of $frac{1}{c^4}$. Why is that?

I am trying to familiarize myself with General Theory of Relativity. I am by no means an expert in the field, and I am doing this as my own hobby....

Asked on 05/27/2021

3 answer

Problem from dipole moment which involves perimeter of elipse

An ellipse has a uniform linear positive charge density in upper half (total upper half part charge $+Q$ ) and a uniform linear negative charge density in lower half...

Asked on 05/27/2021 by Piesquareisg

0 answer

Why is the voltage in inhomogeneous electric fields undefined?

For example I'm thinking about a radial symmetric field like a point charge. The voltage $U$ can be determined by $$int_{r_1}^{r_2} E(r)mathrm{ds} = frac{Q}{4,pivarepsilon_0},left(frac{1}{r_2}-frac{1}{r_1}right)$$ My questions are: why...

Asked on 05/27/2021

2 answer

Help in recovering the Rutherford formula for $epto ep$ scattering in the nonrelativistic limit

If the proton were a point charge like the muon, then $epto ep$ scattering, the differential scattering crossection is $$frac{dsigma}{dOmega}Bigg|_{rm lab}=Bigg(frac{alpha^2}{4E^2sin^4(theta/2)}Bigg)Bigg{1+frac{2E}{m_p}sin^2thetaBigg}^{-1}Bigg[cos^2(theta/2)-frac{q^2}{2m^2_p}sin^2(theta/2)Bigg]$$ where $theta$ is angle scattering, ...

Asked on 05/27/2021

1 answer

No solution to Bragg's law?

Bragg's Law provides a description for the diffraction peaks we observe when x-rays are incident on a crystal structure. We observe these diffraction peaks because the wavelength of the incident...

Asked on 05/27/2021

1 answer

How do neutron stars emit black body radiation?

If my understanding is correct, black body radiation is emitted by a substance due to the substances coupling with the electric field. The negatively charged electrons in atoms for example...

Asked on 05/26/2021 by tucks94

1 answer

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