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242158
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location Greece
age 75
visits member for 4 years, 4 months
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Retired experimental particle physicist.

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


May
11
answered Does lithium-6 “decay” when hit by a neutron?
May
11
comment Question on particle decay process, conservation of energy
as @MichaëlUghetto said . The simplest frame is the rest frame for decays and for any total four vector sum of particles. A single particle in its rest frame just has it mass. More than one will add up to a four vector that will have an invariant mass, larger than the sum of the masses of the constituents, according to their energy and momentum.
May
11
answered Question on particle decay process, conservation of energy
May
11
answered How two photons interfere in a double slit experiment
May
11
comment Where does the angular momentum of the solar system come from?
@user2800708 this would need a model, but logic tells that if material had not been ejected with equal and opposite angular momenta it would still be a cloud, at best of milling asteroids colliding with each other and finally into the core of the star.
May
11
awarded  conservation-laws
May
10
comment Is there any upper limit on a particles kinetic energy?
it seems to me c is a limit to v, and kinetic energy is defined as 1/2*m*v^2, so it approaches a limit as v approaches c, quantum mechanics apart.
May
9
comment What is the significance of the Fourier coefficients?
Maybe this will help you, facstaff.bucknell.edu/mastascu/eLessonsHTML/Freq/… , it is into signal processing. The frequency spectrum of white light by itself is not time dependent .
May
9
comment Why does it hurt more to fall from 10 stories, than 1?
and the relevant quantity when hitting the ground is not acceleration but deceleration, from a velocity v to zero in a microsecond or so.
May
9
revised What is the significance of the Fourier coefficients?
clarification after comment by OP
May
9
comment What is the significance of the Fourier coefficients?
I will edit, as you seem not to know what colors are.
May
9
revised What is the significance of the Fourier coefficients?
edited after edit in question
May
9
comment What materials are used in non thermal plasma?
this helps a bit on temperature definitions for plasma en.wikipedia.org/wiki/Plasma_%28physics%29#Temperatures
May
9
comment What materials are used in non thermal plasma?
maybe this link to the wikipedia article will help orient the question for those who are not familiar. en.wikipedia.org/wiki/Nonthermal_plasma .
May
9
answered What is the significance of the Fourier coefficients?
May
8
comment Both Special and General Relativity carry long term unresolved paradoxes. Should not they now be “inconsistencies”?
I had not heard of the man so I googled. It is not correct that his "world view" is making a dent in the direction of current theoretical research.
May
7
revised Is pair production only with $\gamma$ photons?
added 13 characters in body
May
7
comment Is pair production only with $\gamma$ photons?
Take the electron/positron pair created. at the center of mass system it will always have an invariant mass, equal by minimum twice the mass of electron. The gamma has zero mass, it can never go to a center of mass system too. So it is a process that cannot happen by a single photon. the other answer explains the momentum business
May
7
answered Is pair production only with $\gamma$ photons?
May
7
answered Both Special and General Relativity carry long term unresolved paradoxes. Should not they now be “inconsistencies”?