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Jan
5
comment Temperature below absolute zero?
Honest question - why is this in the news all of a sudden? I was under the impression negative absolute temperature was a fairly pedestrian phenomenon.
Jan
5
comment Is there something special in the visible part of electromagnetic spectrum?
I did rather drift off course, but I guess my point is that the visible part of the spectrum is only special for life due to its energy regime (and as you noted, that there's a high flux in the visible region from the sun). Its time-dependent bandwidth is irrelevant due to biological signalling being many many orders of magnitude slower. Time-independent bandwidth (i.e. this fruit is under/overripe due to its colour) is I believe a function of how many different photoreceptors we have and how specific they are. Most humans have 3, and are able to distinguish a wide range of colours.
Jan
5
answered Is there something special in the visible part of electromagnetic spectrum?
Jan
3
asked What reason(s) exist to suppose that all degeneracy pressures can be overcome in Black-Hole formation?
Dec
26
comment Calculating the speed of an object moving relative to another moving Object (Frame of reference)
This question doesn't really evince much research effort. Have you familiarised yourself with the Lorentz factor?
Dec
14
comment How do electrons jump orbitals?
Beta decay is a nuclear process (specifically a weak process), rather than a chemical one. This said, orbital transitions can occur in inverse beta decay (which is to say, electron capture) however this is only a side effect of an unoccupied core orbital being generated.
Dec
7
comment Why cant one see tidal effects in a glass of water?
You've just concatenated Alex and FrenchKheldar's answers.
Dec
7
awarded  Caucus
Dec
4
comment Is there record of a bosonic Stern-Gerlach measurement?
Weeeeeird, I was thinking of this exact question only a few hours ago. For what it's worth, this discussion on Physics Forums draws an interesting parallel between Stern-Gerlach and birefringence.
Nov
26
answered What's the difference between two Hydrogen atoms?
Nov
23
revised Energy Question
edited tags
Nov
23
accepted How does Delta baryon decay conserve angular momentum?
Nov
20
asked How does Delta baryon decay conserve angular momentum?
Oct
15
awarded  Nice Answer
Aug
4
answered What's up in this SPAWAR video?
Jul
25
comment Is it feasible for an unmanned vehicle to travel from outside the atmosphere of one planet to another without additional propulsion?
@Everyone - Yes, but space missions are planned with interactions with other bodies in mind. Also bear in mind that the vehicle is possibly going to be in some kind of orbit around the sun.
Jul
25
answered Is it feasible for an unmanned vehicle to travel from outside the atmosphere of one planet to another without additional propulsion?
Jul
13
comment Naive Question About Batteries
@mwengler - Point taken, however this polarisation is insufficient to hold a paperclip against gravity. If I recall correctly, the potential differences involved in everyday static cling are on the order of kilovolts. I guess my comment is irrelevant as even if the paperclip were charged it would be neutralised as soon as it came into contact with the battery.
Jul
13
comment Naive Question About Batteries
Your paperclip is electrically neutral.
Jul
12
answered Why are galactic centers always brighter than the edges?