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Jul
27
asked Is Ronald Ace's “solar trap” patent plausible?
Jul
27
answered Is Ronald Ace's “solar trap” patent plausible?
Jul
25
comment Is Gauss' law valid for time-dependent electric fields?
Any textbook about quantum field theory should have a proof that Maxwell's equations + Lorentz Force Law are the classical limit of QED. (Although sometimes it's left as a homework exercise.)
Jul
25
answered Is Gauss' law valid for time-dependent electric fields?
Jul
25
revised Why does normal incidence eliminate the photocarrier effect radiation in this experiment?
edited body
Jul
25
revised Why does normal incidence eliminate the photocarrier effect radiation in this experiment?
added 4 characters in body
Jul
25
answered Why does normal incidence eliminate the photocarrier effect radiation in this experiment?
Jul
19
accepted Why are band maxima / minima often (always?) at high-symmetry points?
Jul
19
comment Why are band maxima / minima often (always?) at high-symmetry points?
@DanielSank - if you make that comment into an answer I'll give you the bounty...
Jul
15
comment Can the energy/power required to mix two fluids together be calculated?
Definitely requires a full numerical model of the shape of the container, shape and speed of the paddle, etc. Just knowing the work is not going to help.
Jul
15
comment Why are band maxima / minima often (always?) at high-symmetry points?
Let me rephrase. Let's say the symmetry group has order 12 for example. In principle there can be 1 band maximum, or 2 or 3 or 4 or 6 or 12 maxima (related by symmetry). My question is: Why is it seemingly very rare for 12 maxima to occur, but very common for 1 (or 2 or 3)? After all, if the maximum occurred at a random point in the BZ, there would be 12 maxima with 100% probability.
Jul
10
revised Why are band maxima / minima often (always?) at high-symmetry points?
edited title
Jul
10
asked Why are band maxima / minima often (always?) at high-symmetry points?
Jul
10
answered Why are bandstructures plotted only along certain symmetry points?
Jul
8
comment energy efficiency - dryer vs hang+dehumidifer
Indeed, when it is hot outside, a well-ventilated basement has higher RH than the outdoors: When the outside air enters the basement, the walls (heat-sunk to the soil) cool the air.
Jul
6
asked energy efficiency - dryer vs hang+dehumidifer
Jul
5
comment Is this a good explanation of electron mobility to the layman?
"Electricity moves faster" is sorta nonsensical. Maybe you mean "more electrical current flows"?
Jul
4
answered Is it possible to build a thermoelectric nuclear power plant?
Jul
3
comment Could anyone help explain this current voltage graph for an LED in liquid nitrogen?
I agree, but it's not a complete answer: You still need to explain why heating the LED might lower the voltage drop.
Jun
24
comment Does optical fiber preserve the angles of incoming light?
My description of how endoscopes work was terribly incorrect, it deserved to be downvoted. But I just deleted that part.