65,178 reputation
243165
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location Greece
age 75
visits member for 4 years, 5 months
seen 12 mins ago

Retired experimental particle physicist.

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


Mar
8
comment How can electrons move along the conductive wire? ( seems to be a paradox )
could you link to an image of what sort of circuit this is?
Mar
8
revised saturation property of nuclear forces ? and its relation binding energy per nucleon constantcy?
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Mar
8
answered saturation property of nuclear forces ? and its relation binding energy per nucleon constantcy?
Mar
8
comment saturation property of nuclear forces ? and its relation binding energy per nucleon constantcy?
There was some problem with formatting that I corrected by the < symbols used. It is a valid question so I do not see why the down vote
Mar
8
revised saturation property of nuclear forces ? and its relation binding energy per nucleon constantcy?
formatting
Mar
8
revised Are leptons, baryons and energy the only products of radioactive decay?
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Mar
8
answered Are leptons, baryons and energy the only products of radioactive decay?
Mar
8
comment “String” infinity paradox
@user12262 In my books all "physics theories" can be falsified by data. Other wise they are not physics theories, they may be beautiful mathematical constructs useful for finding physics theories that will fit the data. For example Thermodynamics: it has laws that are falsified at the microscopic level, i.e. it does not apply there. It is a model/theory of physics for a specific range of physical variables. Outside of that it is mathematics. Classical Mechanics : its postulates are falsified in the region of special relativity . etc. You are thinking of "phenomenological models" .
Mar
7
comment Is any percentage of the regular solar wind that penetrates into Earth's atmosphere able to reach Earth's surface?
Please note that you should qualify, there are electron neutrinos from the sun which are cosmic rays and have been seen in neutrino detectors .
Mar
7
comment What is the height of the electron orbits of an atom?
Have a look at this link for orbitals en.wikipedia.org/wiki/Atomic_orbitals . It was the data that drove physics theories to Quantum Mechanics rather than primitive models like the Bohr model.
Mar
7
comment “String” infinity paradox
@user12262 Physics theories are mathematical models. They are theories because they have postulates over and above the internal mathematical consistency of the models used.
Mar
7
comment “String” infinity paradox
@foggy Every particle is a different "eigenstate" of a string, the way the theory is developing at the moment.
Mar
6
answered How does one detect a single photon?
Mar
6
revised Your Mass is NOT from Higgs Boson
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Mar
6
answered Your Mass is NOT from Higgs Boson
Mar
6
comment Does evaporation decrease entropy?
It seems you are ignoring that the law "entrpy always increases or at most stays constant" applies only to closed systems. When a system is open then entropy can decrease. Crystals coming out of a solution have decreased entropy, since they are so highly ordered. The entropy solution+crystal has increased though from the large number of microstates. Every live thing from the monocell cultures to humans live by decreasing entropy within their volume, but they are open systems.
Mar
6
revised Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
correction after comments
Mar
5
comment Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
What in my opinion is unnecessary is a potential with a constant added, Solutions are always specific and often asymmetric. As I said in my answer the harmonic oscillator potential is a first approximation form for all symmetric potentials when expanded in series, which is very useful for molecular potentials etc. Adding random constants would introduce unnecessary complications in using a generic form.
Mar
5
comment Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
@BMS Then the answer is that the more elegant form for the potential is used rather than the after the solutions simplification of the energy levels mathematical form. It seems though that adding a constant introduces a time dependent phase factor which might be falsified for a specific situation. physicsforums.com/showthread.php?t=71250 by dextercioby
Mar
5
comment Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
@Friedrich The formula comes when one operates with the energy operator on the wavefucntions that are the solutions of the shcroedinger equation for the harmonic potential. it is not arbitrary.