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242158
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location Greece
age 75
visits member for 4 years, 4 months
seen 7 hours ago

Retired experimental particle physicist.

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


May
18
comment Why do two beams of light pass through one another without interacting?
@Floris I am not in a position to discuss non linear optics. If you think it is relevant to beam of light versus beam of light interaction maybe you should add an answer?
May
18
answered Why do two beams of light pass through one another without interacting?
May
18
comment Electric field and Gauss law
that is the misunderstanding: "E that will be calcullated from this formula" E is not calculated, an integral of E is calculated on the surface and the formula says that it will look like a charge Q +q, i.e. the result of the integration, which is the sum of the charges on the surface and inside. To get the electric field you need the differential form of Gauss's law and will have to solve a differential equation and apply the boundary conditions.
May
18
revised Does the statement “waves only transfer energy, not matter” violate $E=mc^2$?
added 595 characters in body
May
18
answered Does the statement “waves only transfer energy, not matter” violate $E=mc^2$?
May
18
answered Electric field and Gauss law
May
18
revised Electric field and Gauss law
spelling of Gauss
May
17
comment What Does it Mean for an Extra Dimension to Have Size?
semantics is not metaphysical . Physics is a meta language on semantics, algebra and mathematics in general, dependent on specific postulates, chosen because they model measurements and predict new situation. Meta physics , in its mathematical formulations, is a meta language that uses new extra postulates to model situations that physics with its postulates cannot model. The predictions and fitting of these are not rigorous within the definitions of physics.
May
17
revised What Happens to electrons after Alpha Decay and Nuclear Fission?
corrected mistake
May
17
comment How electrons move so fast in a electric circuit?
this answer is OK as far as I see. I think it is the "sneak" that brought the downvotes. There are people fast-reading and filling in blanks as they see fit.
May
17
revised What Happens to electrons after Alpha Decay and Nuclear Fission?
grammar and addition
May
17
answered What Happens to electrons after Alpha Decay and Nuclear Fission?
May
16
comment Alpha particle in vacuum
@surelyourejoking tritium. en.wikipedia.org/wiki/Tritium
May
16
comment How to create a vaccum tube & produce electron beam
to see the difficulties of generating a vacuum have a look youtube.com/watch?v=sx5BW-aAR1I
May
16
revised Alpha particle in vacuum
extension after choicing
May
16
comment Alpha particle in vacuum
Decay of a neutron happens when it is energetically possible, i.e. the decay fragments are more bound than the nucleus that decays via neutron decay. (beta-). There is no such case for the alpha and that is why it is stable. Proton decay depending on the new theory, would happen through exchanges of new, non standard model, particles within the proton, in the quark gluon soup it contains. Have a look at the diagram in my answer here physics.stackexchange.com/questions/79064/… .
May
15
comment If proton spin emergence from quarks and gluons is mysterious, why is silver atom spin not?
look at equation 1 here int.washington.edu/talks/WorkShops/int_14_55W/People/Zhao_Y/… . The goal is to justify the sum rule and it seems still a goal.
May
15
comment If proton spin emergence from quarks and gluons is mysterious, why is silver atom spin not?
if you google "lattice qcd and the spin of the proton" you will see that it is an active area of research.
May
15
revised What minimum energy is required to create tracks in a cloud chamber?
clarification
May
15
answered Do the outer gas planets radiate their mass?