I'm trying to understand why neutrons don't just continually bind into large masses. As I understand it proton binding in a nucleus is governed mostly by the strong nuclear force which attracts at close distance and electromagnet force that repels. So for protons to bind, they must have enough...
I'm researching a bit on Compton Scattering, especially in relation to, backscattering scanner, like one would see in an airport. I think I understood that the angle of deflection is in relationship to the loss of energy of the photon, where λf - λi = h/mc(1-cosθ). So if you know the...
I'm learing about antennas in a course, and we are using Jin's Electromagnetic text.
This isn't a homework problem, I'm just trying to understand what I'm supposed to do in this situation.
This part of the text discusses how to evaluate a radiation pattern.
One of the steps to evaluate the...
I get the wrong answere when I use the determinant, even though I divide through with the r^2 sin(theta) last.
I do get the right answer if I use the expanded notation as a guide. So not sure if I'm applying the matrix wrong, or if there's a typo somewhere?
This is from my E&M textbook.
I'm doing a problem where I need to take the Curl in spherical coordinates but I'm getting the wrong answer.
I tried applying the matrix, but it doesn't seem like it make sense with the expansion that they show in the textbook (screenshot below).
If I apply the...
We are using the textbook by Jin, "Theory and Comutation of Electromagnetic Fields".
In the section on metamaterialshe derives the dispersion relationship. He shows that when ε'= -ε & μ' = μ
then the dispersion equation γ =\sqrt{jωμ( jωε +σ )} = α + jβ goes to
γ = α = ω \sqrt{μ'ε'}...
So they are just saying that cos θ can be se^(jξ) = s( cos ξ + j sin ξ ). Where s is any old constant?
They're just decomposing cos θ into a real and imaginary part?
My textbook for Advanced Electomagnetics, by Balinas has this identity.
cos θ = se^(jξ) = s( cos ξ + j sin ξ ).
I have no idea what they are saying. Is there an S funtion I'm not aware of?
I've looked back and forth, and he doesn't seem to explain it's use.
I've inserted a picture of the...
OK. So I was wondering if in general i should think of a grounding system like below, with a capacitance to ground?
Or also I was wondering given the explanation by @Dale if I should just consider both ground point as capacitivly coupled to the same imaginary infinate sphere. Even if both...
Power is just one case where this interests me. I've read that the telegraph systems used a single conductor with an Earth return. Not sure about the old wired telephone system, but I think i was simular. Anways grounding is an important issue, so I'm trying to have a better understanding of...
I'm trying to better understand the physics of how Earth ground works.
In circuit analysis and other electronic courses they usually present a conceptual picture like below where the Earth is viewed as a path that completes a circuit? In this conceptual view, the current travels on the...
Awesome. I think you've cleared things up enough so that I can refine my question and possible post in the "Condensed matter" forum. It seems like this would be right up there alley. Also seems like a course in statistical mechanics would help. If I ever have time someday, I think I'll take one.
Thanks for the explanation!
If i can follow up though, I'm trying to think more specifically about higher frequency radiation (visible light). In solids, as opposed to gasses is there more possibility that a molecule can absorb photons through vibration, rotational modes, instead of electron...
I’m trying to understand how a solid body changes the wavelength of radiation it re-radiates from that which it originally absorbed. I’m thinking in context to the way that the Earth absorbs higher frequency radiation from the sun, but when it re-emits the energy it’s at a much lower frequency...
Hi Stephen. That's exactly what its supposed to be is Maximum likelihood. The two histograms are data samples from two different transmitters, and the "new" sample is from and unknown transmitter that I'm trying to see if it likely came from either of the two transmitters.