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location Greece
age 74
visits member for 3 years, 8 months
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Retired experimental particle physicist.

The picture is a fayum . It looks like aunts and cousins of mine :).


11h
comment What would happen if an accelerated particle collided with a person?
Please note that quite high energy muons do penetrate to sea level as the links in my answer show.
1d
comment Will an un-scattered photon go to the edge of the universe?
@CuriousOne I am answering at the level ofthe question, evidently not from a mathematically adept questioner:"a tidal wave edge" , a front. Every place in the universe now at this t=t_1 is the edge for radiation starting at 380.000 years ago. It is the same mind stretch as "every place in the observable universe is the beginningof the big bang"
1d
comment Chaos theory and determinism
@phonon the climate is one of the first classical examples. But it is not the difficulty of initial conditions that creates chaotic behavior, as the video ( and one in the wikipedia chaos theory article) shows. Unknown initial conditions make things more complicated. Maybe this will help ksu.edu.sa/sites/py/ar/mpy/departments/math/learnResources/…
2d
comment Chaos theory and determinism
@Phonon comment above is for you
2d
comment Chaos theory and determinism
Mostly dynamics. pendulums for example display chaotic motion youtube.com/watch?v=AwT0k09w-jw
2d
comment Can you explain why crystals form without thermodynamics?
@CuriousOne You are right. I have edited
2d
comment Can you explain why crystals form without thermodynamics?
I think the comment of @CuriousOne answers your question. see en.wikipedia.org/wiki/Calcite#Calcite_formation_processes
Sep
28
comment Everyday Low-Energy Atom Collider
"is this like a very low energy particle collider". If you define as "particle" the molecules bonded in the material, yes.
Sep
28
comment Do all atoms get accelerated in a synchrotron?
electrons are particles, but not atoms in the physics language in english. I also think you should read up existing articles and then ask specific questions.
Sep
28
comment Working of fusion reactor
for ITER see the answer here : physics.stackexchange.com/q/70209
Sep
27
comment Hawking (blackbody) radiation, emission or absorption
Yes, black holes they are classically a total sink, but that is not the description of a black body. They are not black bodies . It is a "coincidence" that the hawking radiation follows a black body Plank radiation with the temperature going as 1/M . They are not a thermodynamically evolved black body. Just the horizon gives the Plank spectrum, but the black hole is much more than the horizon.
Sep
26
comment Why doesn't this perpetual motion machine work?
I think it has been put on hold wrongly. There is physics, everyday classical physics in the question, as evinced also by the interest of people with some reputation to answer it
Sep
25
comment Why is the sky never green? It can be blue or orange, and green is in between!
you could edit and put the image of the sun spectrum in the link I gave you in your answer, to strengthen it.
Sep
25
comment Why is the sky never green? It can be blue or orange, and green is in between!
www2.lbl.gov/Science-Articles/Archive/assets/images/2002/… gives the solar spectrum in color.
Sep
25
comment Why is the sky never green? It can be blue or orange, and green is in between!
dailymail.co.uk/sciencetech/article-1387993/… also onebigphoto.com/green-sky-of-alaska
Sep
24
comment Did the Big Bang happen at a point?
@JoeBlow No. Read the answer by John. The quantum picture joins smoothly with the classical picture and the quantum dimension is expected to make the origin,time=0, point fuzzy. You can gain an intuition by the surface of a balloon analogy. On the surface of a balloon two dimensional intelligent species would feel expansion and all points of their world receding from each other, but the third dimension would have no meaning within their world. In the beginning of their time all balloon points would extrapolate to that one point where the expansion started. All points were the beginning point
Sep
24
comment Parity of baryons. Why it is hard to find the parity determination of baryons?
Maybe you have not looked at en.wikipedia.org/wiki/List_of_baryons . slide 2 here www.physics.ohio-state.edu/~kass/P780_L6_sp03.ppt . baryons by convention have parity +
Sep
24
comment What will happen if two photons collide perpendicularly?
@BrandonEnright Photons interact with each other very weakly, with higher order terms so they cannot be considered in this framework. It is classical intererence patterns for coherent sources , digitalcommons.unl.edu/cgi/… spurious interference patterns for incoherent ones,
Sep
24
comment Experiment which shows that Newtons third law is not true for magnetic forces
From the link above "Feynman gives a simple example, two charge particles, one moving directly towards the other and the other one moving in some other random direction ." from this I would guess that if one set up two wires one in the x direction and the other in the y, with two independent dc circuits and started a dc current at the same time on both (with the correct direction) , only one of them would move. It would be interesting to try if you have the lab equipment. see relevant paragraph digitalcommons.unl.edu/cgi/…
Sep
24
comment Experiment which shows that Newtons third law is not true for magnetic forces
have a look also at this which clears up the situations of the "naive" violation of third law physics.stackexchange.com/questions/43269/…