63,745 reputation
242158
bio website
location Greece
age 75
visits member for 4 years, 4 months
seen 19 mins ago

Retired experimental particle physicist.

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


16m
comment Have two identical quantum mechanical experiments ever been done?
@Joseph your last comment makes no sense. At the atomic level one is in the Heisenberg Uncertainty Principle range and no such controls can even be imagined.
7h
comment Why does the magnitude squared of the wave function give us the probability density?
@JánLalinský Of course it makes sense. Physics is not mathematics. It uses mathematics with extra postulates with the strength of axioms, which connect/interpret the mathematical formulae to physically measurable quantities. One of these physics axioms/postulates is the interpretation of the quantities as probabilities for measuring observables. Without a version of the Born rule quantum mechanics does not make sense, does not connect with the data. hyperphysics.phy-astr.gsu.edu/hbase/quantum/qm.html
19h
comment Why does the magnitude squared of the wave function give us the probability density?
@JánLalinský One will always hit an ultimate "why" that can only be answered with "because we want to fit the data coming from the experiments". It is not a mathematical theory, it is a mathematical model for the behavior of nature.
1d
comment Can we create heavier particles with high energy?
see my answer for references that pair creation happened already at LEP
1d
comment What can change a photon's frequency?
If you read the link provided you will see that the blue becomes dominant because it is elastically scattered with higher crossection " This scattering, called Rayleigh scattering, is more effective at short wavelengths (the blue end of the visible spectrum). Therefore the light scattered down to the earth at a large angle with respect to the direction of the sun's light is predominantly in the blue end of the spectrum. " there is no discrepancy as QM takes care of individual scatters ( the more and the less in the phrase)
1d
comment What exactly happens in an electric circuit?
this link may help: hyperphysics.phy-astr.gsu.edu/hbase/electric/battery.html . "Upon reaching the negative terminal does it reappear at the positive terminal via the electrolyte?" it would defeat the point of a battery. Chemical reactions give ions because the battery is charged, until the battery is spent. look at the schema
2d
comment Why does Earth accelerate every object toward itself with acceleration of $9.8\, m/s^2$
@TheDarkSide it is a combination with the naivety of the question. As for myself, I am 75 and hope to be active on the net at 95 :)
2d
comment Why does Earth accelerate every object toward itself with acceleration of $9.8\, m/s^2$
down voters please note the age of the questioner :13
2d
comment Radioactivity, alpha decay
I deleted my comment because Bill N edited the question. It was so badly written that I read "U" as you ( shorthand in phones)
May
24
comment Why do only heavy radioactive elements perform fission or fusion?
Radiation damage is complicated issue, and not my specialty, to write stories about. I already gave a link above . Here is a talk teachers.web.cern.ch/teachers/archiv/HST2002/feynman/… , in page 7 it shows the cotnribution of nuclear processes to the radiation damage. Here are proposals to use induced fission to make radioactive waste from nuclear reactors harmless. irs.uni-hannover.de/uploads/tx_tkpublikationen/drshams.pdf
May
24
comment Can a proton be trapped by eight other protons?
@CuriousOne for a metastable state one would need a complete solution
May
24
comment Neutron antineutron reaction documentation
@MiladP. Yes, the five pions have in sum charge 1, the charge of the proton on which the antineutron annihilated. Charge exchange means that the antiproton exchanges its charge with the proton, it becomes an antineutron and the proton becomes a neutron: teachers.web.cern.ch/teachers/archiv/HST2002/feynman/…
May
24
comment Can a proton be trapped by eight other protons?
@CuriousOne I am just arguing from the symmetry of the problem.
May
24
comment Can a proton be trapped by eight other protons?
in a completely, but completely symmetric system, it can sit there. In the middle in a metastable position, the slightest asymmetry, a cosmic muon passing through for example, will send it hurdling out, between the field lines against the interaction with the muon, accelerated as it is leaving.
May
24
comment Why do planets move in fixed orbits?
yes, it is a steady v for the rotating stone other wise the system will imbalance and the stone may hit you.
May
24
comment Why do planets move in fixed orbits?
what coilkid said. you are applying the force/work against the centrifugal force
May
24
comment Why do planets move in fixed orbits?
If you rotate a stone on a string what prevents it from hitting your hand?
May
24
comment Quantization in Black Body Radiation
this link makes it clear : hyperphysics.phy-astr.gsu.edu/hbase/mod6.html#c6 it is maxwell's equations that have to be used to solve for radiation and classically they come out into the ultraviolet catastrophy.
May
23
comment Can a microwave oven induce an accumulation of static charge in food?
have a look here gizmodo.com/… "Sometimes the electromagnetic field within the microwave can get a little mixed up and generate small arcs of electrical discharge. This can be caused by innocuous items like carrots (when grown in mineral rich soil) and hot dogs (when the salt and additives aren't properly mixed). " So electric fields do build up possibly because of inhomogeneities in the distribution of salts or whatever within the organic material.
May
23
comment Why there is no mention of Archimedes Principle in whole Fluid Mechanics?
this seems to be a course in fluid dynamics and statics physics.usyd.edu.au/~jbryant/Fluids/Fluidslect3.pdf. A principle is in fluid statics.