Interesting, I didn't consider that. How can one tell if the coal is still undergoing combustion? And let's assume that its no longer combusting. In that case, how's the model look?
So a sadistic friend of mine posed this question:
Of course this question can be thought of in two ways: a) would the surface still be hot enough at the bottom or b) would the interior be hot enough at the bottom (since the coals would probably break, its a relevant question).
At the time...
Hey everyone,
Not sure if this is the right section to post this in, but makes the most sense to me so here goes.
Consider a game with k players. Now suppose that if only two of the players are allowed to make changes to their strategies (i.e. k-2 players are frozen) then those two players...
Agreed, but my question is more about what happens below the threshold.
If the photon does not have enough energy to excite an electron beyond the ground state, my quantum intuition tells me that the photon would just pass through as if there was nothing there.
My classical...
Going off topic for a bit, Zeno's paradox has been resolved with the understanding continuity and limits (concepts in calculus or as known in mathematics, analysis). The amount of time it takes to reach the wall is not infinite because even though you keep summing intervals of times...
I understand sinusoids make up the EM wave packet, however this doesn't explain whether the sinusoids are physical things, after all, in general there are infinitely many of them, in fact uncountably many of them (using mathematical parlance). Am I to take this that infinitely many photons are...
So we all learn in E&M and Optics courses that light is an EM wave. We play with simple models of light in which we treat a beam as a single frequency sine wave occupying the entire space. This of course is wrong since all physical signals have finite support (they are non-zero only on a finite...
Hmm, so in essence QED quantizes the field? And when this quantization is done, we identify excited states with photons?
A related question then is what do the photon wavefunctions look like?
I don't profess of a knowledge of QED, and am in fact incredibly ignorant of its formulation and nuances, however I do understand that its never been refuted and is the crown jewel of physical models. So I will take it as fact for this post.
What confuses me, is that in quantum mechanics...
When monochromatic light propagates through a material other than a vacuum, we observe that its phase velocity has moved away from c. By relativity, we know that massless particles like the photon must move at the c however the pragmatics of classical optics ask of us to overlook this fact in...
Awesome, looks very promising but unfortunately in its current presentation might be a little to dense for me.
I do notice that it mentions the group velocity definition very briefly as a sufficient condition for the phase being "stationary". I'm having a hard time understanding the...
Hi there
So I was looking into group velocity and related matters and found myself quite confused. So now I have a few questions which I feel I need to understand (primarily the first one). Any help with these would be awesome and I would be very grateful...
1) Why is the group...
Thanks for the reply Jeff.
I think I'm starting to get pushed in the right direction now. So it seems that once the depletion zone is set up to a certain width, there is a field there of enough strength to lower the likelihood of electron diffusion to the other side to zero.
Now I think...
Background: Math & Physics undergrad
Reason for asking:
So I was trying to understand semiconductor diodes and realized it all hinged on the PN junction which in turn is worthy of attention because of the effect created by the depletion zone. As I continued on studying up on this I began...
When there are two particles with spin s1 and s2 the composite system has possible spins s1+s2 all the way down to |s2-s1| (using integer steps). The azimuthal quantum number goes from s1+s2 to -s1+s2 (using integer steps).
Now my question is if we had three particles (or more) how would we...