Recent content by dhqpwoe

Thank you Bob. I am about to look over the NIST report and that book. You are correct that I am not interested in the physics determination of gamma ray energies. I am measuring the gamma dose rate of objects (in order to model the gamma dose rate field around them to determine if they are...

Hey everyone, I need to be able to be able to explain how a gamma spectrometer (NaI scintillator) can determine the energy of a given gamma ray (or more particularly, determines the effective dose rate, but that shouldn't be to hard once I figure out how to get the energy). The problem, as far...

Is the solution key wrong? (Should I be integrating from s to s+a?)

Homework Statement A square loop, side a, resistance R, lies a distance s from an infinite straight wire that carries current I. Now someone cuts the wire, so that I drops to zero. In what direction does the induced current in the square loop flow, and what total charge passes a given point...

Okay maybe I understood the whole time but was explaining it poorly. If there were only one plate, would D be sigma/2? The way I see it, inside each plate contributes sigma/2 and outside they cancel. That is what I meant by adding. Calculate the D contribution of each plate and then add...

If we were finding E inside, we could simply find the E contribution from one plate and add to to the E contribution from the other plate, no? Why does that not work here? I think that I'm just thinking about the problem really wrongly or something. (Sorry for being such a trouble, too, I just...

I get all that... But don't both plates contribute to the electric displacement? As in, aren't you just finding the divergence caused by one of the plates? I would do what you just did for the top plate. Then I would do the same thing for the bottom plate. And then I would add them. That...

Okay I thought I understood it, but now I really don't think that I do. Is it true that the electric displacement caused by one plate is (sigma)? Then is it not true that the displacement caused by the second plate is also (sigma)? So then don't we add them to get that the total...

There is a // plate capacitor with one plate charged (sigma) and the other charged (-sigma). Between the plates are 2 dielectrics each of thickness a. (This does not matter to my question). Why is the electric displacement equal to sigma? Every solution I find draws a gaussian surface around...