I'm trying to understanding "Heat of Vaporization" in fundamental terms.
People say that processes like evaporation and boiling are endothermic because chemical bonds are being broken, but for actual cooling to occur there must a loss in translational kinetic energy of the molecules involved...
Lindemann's theory of melting does indeed suggest the molecular forces are not significantly different, but Max Born's model was completely dependent on that idea.
Neither of those models have stood up to 70 years of scientific testing, but one would hope that neither is completely wrong...
When describing change of phase, it is very commonly said that molecules in hotter materials vibrate more, weakening the intermolecular bonds within them.
My question is "How can increased vibrational velocity weaken these bonds?"
It certainly makes sense that greater vibration increases...
By the way, looking back at my original post, I do think the points raised there are still valid.
The gray areas represent regions where the Biot-Savart law (using displacement current related to the change in the electric field) yields a magnetic field at A in the 'out of page' direction. If...
The heavyside function is not differentiable. I am not dealing with distributions here. Even if we use plane waves (which I prefer not to), it doesn't get around the basic point I have made all along. The question is "How can a point at the edge of a wavefront go from having a zero E-field and a...
Because there is no necessity for a function varying on an open interval to have a non-zero derivative at a limit point of that open interval.
For example, consider f(x) = x^2 for x<0 and f(x)=0 for x>=0.
That function varies to the left of 0 and is fixed at zero for x=0 or greater, but its...
I never said that the partial derivatives were zero because the function is zero at (ct,0,0).
I said they are zero because the function is also zero on the entire half-plane (ct + epsilon, y, 0), for epsilon>=0.
Now we are getting somewhere! I hope you will indulge just a couple more rounds.
In an earlier post, I claimed the curls at (ct,0,0) were zero, to which you responded:
I disagree. Keep in mind the original question I had in mind. Some source at the origin initiates an EM wave, and we are...
Dale,
Don't the differential forms merely tell you how a magnetic field is changing, not what its actual value is?
Your remark about using the differential forms leads me to ask you a follow-up question. Recall that I'm asking about the very edge of a light wave. Assume basic laws of...
What about them does not make sense?
If you wish to calculate the magnetic field at a certain point based on the rate of change of electric fields nearby (using Amphere's circuital law), there are certain points where the fluctuation will contribute a positive-z value to the integral and...
I was looking into propagation of EM waves, and it appears there is an overlooked nuance here. It is often said that EM-waves are self-propagating because a change in the E-field causes a magnetic field nearby, so a constantly changing E-field [i.e. a "vibrating" field] causes a constantly...
I have a question... could you explain where the constancy of the speed of light for all observers is used in the derivation of E=mc^2 indicated here: http://www.adamauton.com/warp/emc2.html
The reason I ask is that the derivation on that page does not appear to use anything other than...
Qualitative methods in physical kinetics and hydrodynamics [Krainov] offers this explanation: "An ideal lattice does not offer any resistance to a current of conduction because of the coherence of the scattered electron waves from the ions of an ideal lattice."
This seems like something I could...