223 reputation
16
bio website
location
age
visits member for 3 years, 8 months
seen Nov 19 at 6:37

Nov
13
comment How large can an atom get? What's the farthest an electron can be from its nucleus?
See also my closely related question physics.stackexchange.com/q/144819/2818
Nov
6
comment What is the most efficient information storage?
@WetSavannaAnimalakaRodVance: I don't think it scales as $n$ but rather as $n^2$ (making the volume scale as $n^6$), see physics.stackexchange.com/q/144819/2818
Nov
5
comment What is the most efficient information storage?
@WetSavannaAnimalakaRodVance: Doesn't the radius scale as $n^2$? But in any case having $n^3$ distinguishable states isn't a problem, since they only contain $\log_2(n^3)\sim k\log n$ bits of information.
Nov
4
comment How big is an excited hydrogen atom?
:) No need, just curious.
Nov
4
comment How big is an excited hydrogen atom?
In other words, for large enough $n$, it would be difficult to measure $n$ accurately.
Nov
4
comment How big is an excited hydrogen atom?
Thank you! Does the "some more" mean multiplying by a (large) constant, or will it scale up faster as $n$ increases?
Nov
4
accepted How big is an excited hydrogen atom?
Nov
4
asked How big is an excited hydrogen atom?
Aug
14
comment When a star becomes a black hole, does its gravitational field strength become stronger?
This applies once the ejecta pass the planet's orbit, right?
Aug
3
awarded  Commentator
Aug
3
comment Forces other than the fundamental interactions, e.g. friction
Nice answer. Any suggestions on where I could learn more (at a fairly basic level) about the $r^{-6}$ interaction? (E.g., why is the next term not $r^{-4}$?)
Jul
2
awarded  Curious
Jun
27
comment Are galaxies “disk” shaped?
We often see them edge-on, so we have a pretty good idea of what general galaxies' z-axes look like.
Mar
21
awarded  Citizen Patrol
Oct
23
comment Surface gravity for a rotating charged black hole
Thanks, that's just what I was looking for! (I'll upvote as soon as I can -- not able to right now.)
Oct
23
awarded  Yearling
Oct
23
accepted Surface gravity for a rotating charged black hole
Oct
23
revised Surface gravity for a rotating charged black hole
not actually homework, just personal interest -- in fact I've never taken a class on this, as may be evident from my lack of sophistication
Oct
22
asked Surface gravity for a rotating charged black hole
Jun
20
comment How many qubits are needed for useful computation?
And Seifert says it can be done in $(1+\varepsilon)\log n$ qubits. I don't know the size of the implicit error term but this could lower the threshold to 700 or so.