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9h
comment Homemade salad dressing separates into layers after it sits for a while. Why doesn't this violate the 2nd law of thermodynamics?
After way too much time, I see that my criticism was incorrect. Apologies for my confusion...
9h
revised Homemade salad dressing separates into layers after it sits for a while. Why doesn't this violate the 2nd law of thermodynamics?
Correct error.
13h
comment Reverse bias P-N junction
@IncnisMrsi, I've added a sketch of stored-charge analysis, plus a link to reference with figures (which are always helpful).
13h
revised Reverse bias P-N junction
added stored-charge analysis sketch.
20h
comment Reverse bias P-N junction
@IncnisMrsi, yes, the depletion region is formed by depleted majority carriers. However, if you want to understand how much current flows in a reverse-biased diode (the question I'm addressing) you must focus on the minority carriers (the ones the applied field can sweep across the junction), and minority carrier concentrations are in fact depleted by a reverse bias. It's not an exclusive-or situation.
Oct
18
reviewed Approve suggested edit on Why do people recommend wider tyres in car for better road grip?
Oct
17
reviewed Approve suggested edit on How is antimatter made?
Oct
17
awarded  Civic Duty
Oct
17
answered Which BICEP2 r value should be compared to Planck's r<0.11?
Oct
17
answered Field of moving charge / Lorentz;Lienard-Wiechert
Oct
17
revised Feynman's proof for Liénard-Wiechert's potential of a moving charge
added analysis.
Oct
15
answered Feynman's proof for Liénard-Wiechert's potential of a moving charge
Oct
14
revised What experiments compete with BICEP 2, and when are their results expected?
added description of current situation
Oct
14
reviewed Reject suggested edit on Is this summary of modern theoretical physics correct?
Oct
14
reviewed Reject suggested edit on Why in PN junctions the octet rule is dominating electrostatic repulsion?
Oct
13
reviewed Approve suggested edit on Why in PN junctions the octet rule is dominating electrostatic repulsion?
Oct
10
answered What was Feynman's “much better way of presenting the electrodynamics” — which did **not** appear in the Feynman lectures?
Oct
8
reviewed Reject suggested edit on Tokamaks and the reason they are still not efficient
Oct
8
reviewed Reject suggested edit on Stopping Distance (frictionless)
Oct
7
comment Why is Earth's climate so stable?
A leading (maybe the only?) explanation for the escape from snowball earth is by Kirschvink: the build-up of atmospheric carbon dioxide (and resultant surface heating) emitted by volcanoes, since the usual scrubbing mechanisms are ineffective in snow-land. Reference: web.gps.caltech.edu/~jkirschvink/pdfs/laRechercheEnglish.pdf