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Mar
29
awarded  Notable Question
Feb
18
comment Is it possible to see satellites with the naked eye?
@honeste_vivere - It was pretty certainly the evening when I noticed them (also hinted at by the word "dusk" in the post). I don't get up early enough to see the sunrise at that time of the year. :)
Feb
18
comment Is it possible to see satellites with the naked eye?
@honeste_vivere - Northern hemisphere, at spring 4 years ago, as you can see in the question. :D Also, I'm not much of a stargazer, this was just a one-off curiosity question. :)
Dec
12
awarded  Popular Question
Feb
24
awarded  Curious
Feb
23
comment If a black body is a perfect absorber, why does it emit anything?
@AlfredCentauri - In real life it couldn't, but we're talking about idealized stuff here anyway. Or, well, that was my reasoning. I see now that the word "absorbs" has a different meaning than I thought.
Feb
23
comment If a black body is a perfect absorber, why does it emit anything?
OK, I'll accept this. I guess I understand it now, but really it raises more questions in other directions. I'll have to think about it more before I ask my next question.
Feb
23
accepted If a black body is a perfect absorber, why does it emit anything?
Feb
23
comment If a black body is a perfect absorber, why does it emit anything?
@JimdalftheGrey - Hmm... this is going in circles. Blackbodies are emitting blackbody radiation because they are blackbodies that emit blackbody radiation. I'm kinda trying to approach this like maths - start with some definitions (and possibly axioms), then layer theorems on top of them. But I find it difficult to find the bottom of it all (the definitions). :(
Feb
23
comment If a black body is a perfect absorber, why does it emit anything?
Gah, the more I think about it, the more I feel like I'm going to be spending most of my time in a dictionary rather than in physics articles. :P
Feb
23
comment If a black body is a perfect absorber, why does it emit anything?
@JimdalftheGrey - Hmm... I guess I had a different idea of what "absorbs" means. And also... well, if you allow it to absorb and then re-emit, then how can you tell that that was what happened and not just some reflection/filtering/whatever thing?
Feb
23
comment If a black body is a perfect absorber, why does it emit anything?
@ACuriousMind - and if it always emitted the radiation in a way that mimics reflection (preserving the direction, wavelengths, etc) - would that also count as a "blackbody"?
Feb
23
asked If a black body is a perfect absorber, why does it emit anything?
Apr
17
awarded  Popular Question
Mar
8
awarded  Notable Question
Nov
26
awarded  Yearling
Dec
10
comment How neutrinos can be harmful?
If you stay a respectable distance from any exploding stars then you are OK - This just made my day! :D
Dec
10
asked What would the magnetic field look like for a rod like this?
Nov
19
awarded  Nice Question
Nov
13
awarded  Popular Question