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Dec
15
awarded  Popular Question
Dec
4
comment Photons straight into black hole
@HDE 226868 Schwartzshield solution can only approximate a very large black hole during a short amount of time when the evaporation is negligible. And approaching the horizon closely any way takes a lot of time.
Dec
4
comment Photons straight into black hole
@HDE 226868 Schwartzshield solution is a static one, which does not change with time.
Dec
3
answered Photons straight into black hole
Dec
3
comment Photons straight into black hole
Well, not actually retreating. An infalling onserver upon crossing the horizon will find it to cover the whole sky and approaching closer. He will find himself inside a shrinking sphere. But this is again for Swartshield (eternal, unchanging, unevaporating) solution.
Nov
24
asked What are the hypothetic cases when entropy of a closed system may decrease?
Nov
17
comment Is chain reaction possible in stable isotopes?
This table shows critical mass for some other isotopes (including americium): en.wikipedia.org/wiki/Critical_mass It seems the critical mass is not dependent on the half-life, but there is no stable isotope in the list. Why?
Nov
17
comment Is chain reaction possible in stable isotopes?
This list is not complete. For instance, Neptunium-236 is missing en.wikipedia.org/wiki/Isotopes_of_neptunium#Neptunium-236 and others.
Nov
17
asked Is chain reaction possible in stable isotopes?
Nov
11
comment Does someone falling into a black hole see the end of the universe?
@Ben Crowell then this theory is not applicable to such range of time.
Nov
6
comment What happens in electron-electron collisions?
What about finding the internal structure of electrons?
Oct
28
answered Why would the lack of air in a mine in an asteroid prevent you from flooding it?
Oct
28
comment Why would the lack of air in a mine in an asteroid prevent you from flooding it?
It will not boil away. Only a part of it will boil, the other part will freeze.
Oct
25
reviewed Approve Do all massive bodies emit Hawking radiation?
Oct
24
comment Why does the speed of light have no uncertainty?
@Incnis Mrsi spacetime depends on some constant c, in certain circumstances objects can move faster than c, if this does not break causality. For instance, quantum tunnelling is possible with speeds faster than c (again due to quantum uncertainty). en.wikipedia.org/wiki/…
Oct
24
comment Why does the speed of light have no uncertainty?
@Incnis Mrsi I agree the link is wrong though, I removed it.
Oct
24
revised Why does the speed of light have no uncertainty?
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Oct
24
comment Why does the speed of light have no uncertainty?
@Incnis Mrsi what do u call "established wisdom"? Established wisdom is that in Special Recativity transfer of information faster than light is impossible. Here is no transfer of information faster than light, so where it contradicts "established wisdom"?
Oct
10
asked Can an article having spin be seen as spinless in a properly choosen frame of reference?
Oct
10
revised Is this derivation of Black Hole entropy viable?
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