68,305 reputation
348179
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location Greece
age 75
visits member for 4 years, 7 months
seen 1 hour ago

Retired experimental particle physicist.

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


Aug
25
awarded  Enlightened
Aug
25
comment How do we see? Where do the photons disappear?
@JDługosz If photons were stored and released, the mass of the electron would change get smaller or larger. But probably the answerer does not believe in special relativity either. This answer is complete fabrication
Aug
24
awarded  Nice Answer
Aug
24
answered How do we see? Where do the photons disappear?
Aug
24
answered Magnetic Force Confusing Paradox
Aug
24
answered Superconducting electromagnets?
Aug
24
comment Superconducting electromagnets?
This series of videos are interesting as introduction youtube.com/watch?v=-3rEGlyZwAc
Aug
24
comment Who foots the (magnetic) energy bill?
@user36790 Fine, thanks
Aug
24
awarded  Revival
Aug
24
comment Modeling of Big Bang
and the question is?
Aug
24
comment Who foots the (magnetic) energy bill?
@user36790 no problem. I am an old dog and it is hard to learn new tricks like mathjax.
Aug
24
comment How much energy is released from the splitting of a single hydrogen atom?
why dont you use the binding energy curve?1 MeV if it can find a neutron to bind with.
Aug
24
answered An infinite value for an electric field?
Aug
23
comment Fundamental paradox with Newton's Law of Gravity?
g is for the earth. When sizes are similar the differences appear as Gert says
Aug
23
comment Fundamental paradox with Newton's Law of Gravity?
when we are observing on earth at rest there is g standard for all bodies. On a falling particle the earth is seen as motionless because of the large difference in masses
Aug
23
comment Fundamental paradox with Newton's Law of Gravity?
@Kelvin you are confusing two different reference systems: You take A at rest. When A is at rest B is moving. When B is at rest A is moving. Only in the center of momentum system the particles moves against each other with the same momentum en.wikipedia.org/wiki/… and thus the acceleration has to be the same
Aug
23
answered How to understand the motion of a particle in Quantum Mechanics?
Aug
23
revised Physics of color: why do visible colors absorb all colors except the color itself?
added image
Aug
23
answered Physics of color: why do visible colors absorb all colors except the color itself?
Aug
23
comment How to produce neutrons
a neutron is a single particle. If you mean an agglomerate of neutrons you should say so in your question, "mass composed only of neutrons". Neutrons decay within minutes and there is no way to keep one neutron bound to another except if an external force, as the collective nuclear force in the nucleus , exist. That is why tritium is unstable, it takes two protons to bind two neutrons in the deuteron : build up a collective potential well with stable binding levels. In a neutron star it is gravity that does the job from the great mass of zillions of nucleons.