Physics Questions, Problems & Solutions : TransWikia.com ~ Page 155

Ward Identity for Pair Pair Annihilation

The following Feynman Diagrams for the process $e^++e^-togamma+gamma$ are: Knowing this I wrote the amplitude matrix: $$M =...

Asked on 07/27/2021

0 answer

Simplifying Equation - Quantum String

In this post Quantum String action , the user does the following manipulation : $$delta (H_{mnp})H^{mnp} =partial_mdelta(B_{np})[H^{mnp}+H^{pmn}+H^{npm}] $$ I can't quite understand how he does that, I get...

Asked on 07/27/2021 by RFeynman

1 answer

If the difference in pressure is zero between two points of a horizontal constant radius pipe, why isnt flow rate zero?

In a straight pipe of uniform cross-sectional area filled with a nonviscous, incompressible fluid, the pressure at one end is equal to the pressure at the other end. Which of...

Asked on 07/27/2021 by Kevin Lee

1 answer

Back emf when circuit is closed and opened and the conservation of energy

Ok, this might sound like a stupid question but I am legitimately confused. Imagine a circuit connected to a solenoid. When a circuit is closed (by a switch), there will...

Asked on 07/27/2021 by chematwork

1 answer

Non-reciprocal time dilation

Is this report describing Absolute Lorentz Transformation legitimate or pseudoscience? The reporting sounds like the kinds of things I see in newbie's questions on the twin paradox, or...

Asked on 07/27/2021

3 answer

Calculation of heat flux on a surface

I have a basic question about calculating heat flux applied to a surface. Suppose you have a solid cylinder that has a height of 1 $text{cm}$ and a radius...

Asked on 07/27/2021 by Andreu Payne

1 answer

A question on electric current

In my physics book the definition of current isIf a charge $∆Q$ crosses an area in time $∆t$, we define the average electric current through the area during...

Asked on 07/27/2021 by learner5482

1 answer

Heat loss of an insulated pipe vs an uninsulated pipe

So I have this exercise: A hot water pipe consists of a copper tube of length $L = 1$ m, of thermal conductivity $lambda_{1} = 380$, has an...

Asked on 07/27/2021 by schrodingal

3 answer

Which math modules to specialize in as a mathematics undergraduate if I want to study theoretical physics at masters?

I am currently studying Mathematics as third year student, which is the last year in our french based system in Algeria. But I would like to pursue a masters degree...

Asked on 07/27/2021 by Fnechz

0 answer

Show that differential cross section is independent of $θ$ for elastic scattering

I have two hard sphere which took part in elastic scattering, I have attached a diagram below and I have assumed here that since its is elastic the angle of...

Asked on 07/27/2021

1 answer

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