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denise
mesaj 24 Nov 2005, 08:15 PM
Mesaj #71


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ohyeah.gif Uite ca s-au descurcat


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Mihai
mesaj 24 Nov 2005, 08:20 PM
Mesaj #72


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Mda devil.gif


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Olaf
mesaj 25 Nov 2005, 03:25 PM
Mesaj #73


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Mihai, la intrebarea 322
QUOTE
322. Fizica
I: Care este denumirea celei mai mici particule elementare din domeniul fizicii atomice?
R: Quark

Masa unui electron-neutron este mult mai mica decat masa oricarui quark. Presupun ca asta se intelege prin "mica", avand in vedere faptul ca dimensiunile nu pot fi masurate, deci raspunsul corect ar fi "lepton" sau mai degraba "electron-neutron" (avand in vedere faptul ca exista 6 tipuri de leptoni) si nu "quark" (quark este, larandul lui, o categorie de particule, din care fac parte 6 tipuri de particule, de mase diferite).
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Promo Contextual
mesaj 25 Nov 2005, 03:25 PM
Mesaj #


ContextuALL









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Mihai
mesaj 25 Nov 2005, 03:34 PM
Mesaj #74


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http://education.jlab.org/qa/quark_01.html
QUOTE
So far it looks like there is nothing smaller inside an atom than quarks. Our experiments look for evidence that quarks have some sort of shape or structure. If they do have a shape or structure rather than just being a point (which by itself is a very difficult concept to understand), then there might be some sub-quark constituents. At present there is little or no evidence of any structure to the quark. Maybe there is though! That might be something for you, the next generation, to look for and try to figure out!
QUOTE
Could there be anything smaller inside of an electron or inside of a neutron or a proton?
Yes, there could. Right now, our best evidence says that there are particles inside of neutrons and protons. Scientists call these particles quarks. Our best evidence also shows us that there is nothing inside of an electron except the electron itself.


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Olaf
mesaj 25 Nov 2005, 03:46 PM
Mesaj #75


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QUOTE

There appear to be five major groups of elementary particles:
1. "left handed" "quarks" (whose momentum is parallel to their magnetic moment)
[...]
The quarks are the constituent particles in composites like the proton and the neutron
[...]
2. "right handed" quarks (momentum is antiparallel to magnetic moment)
3. left handed "leptons"
[...]
These include our friend the electron, its heavier brothers and sisters, and the very light (perhaps massless) neutrinos. Neutrinos do not interact electrically, strongly or (very possibly) gravitationally.
[...]
4. right handed leptons
[...]
5. the "antiparticles"
[...]
QUOTE

quarks interact electromagnetically and strongly, since they have both electric and color charge

http://www.rwc.uc.edu/koehler/biophys/7f.html

Prin "strongly" se inteleg interactiunile nucleice.


QUOTE

It turns out that protons and neutrons are made of varieties of a still smaller particle called the quark. At this time it appears that the two basic constituents of matter are the lepton (of which the electron is one type) and quark; there are believed to be six types of each.
QUOTE (Mihai @ 25 Nov 2005, 02:34 PM)

QUOTE

Could there be anything smaller inside of an electron or inside of a neutron or a proton?
Yes, there could. Right now, our best evidence says that there are particles inside of neutrons and protons. Scientists call these particles quarks. Our best evidence also shows us that there is nothing inside of an electron except the electron itself.



smile.gif
Ideea este ca neutronii si protonii sunt formati din quarci, dar electronii (de exemplu) nu. Si exista o intreaga clasa de particule care nu sunt quarci si nu sunt formate din quarci, din care multe sunt mai usoare decat orice quark.

Si asta numai daca nu consideri bosonii (care, practic, la viteze mai mici decat viteza luminii nu au masa) particule wink.gif

Acest topic a fost editat de Olaf: 25 Nov 2005, 04:05 PM
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Mihai
mesaj 25 Nov 2005, 06:12 PM
Mesaj #76


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http://www.newton.dep.anl.gov/askasci/phy00/phy00494.htm hmm.gif


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Olaf
mesaj 25 Nov 2005, 06:32 PM
Mesaj #77


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Tocmai, se ia in considerare masa smile.gif

http://www2.slac.stanford.edu/vvc/theory/quarks.html
QUOTE

Flavor  Mass(GeV/c2)
(e)
u  up          0.004
d  down  0.008
c  charm  1.5
s  strange  0.15
t    top    176
b  bottom  4.7
QUOTE

Upper limits for neutrino masses
    * Electron neutrino: m < 2.2 eV (Mainz)
    * Majorana mass of the electron neutrino: 0.24 eV Depending on the nuclear matrix element.


Parca 2.2eV/c2 este mai mic decat 8MeV/c2 rolleyes.gif

Acest topic a fost editat de Olaf: 25 Nov 2005, 06:38 PM
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Mihai
mesaj 25 Nov 2005, 06:41 PM
Mesaj #78


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Tocmai ca... nu se ia in considerare:
QUOTE
The "size" of atomic and sub-atomic particles loses its meaning, because these "particles" behave as though they are waves, or wave packets. So "size" becomes kind of "squishy".


In plus:
QUOTE
the "classical" radius of a "free" electron is taken to be about 3x10^-15 meters, and the "classical" radius of a "free" proton is taken to be about 1x10^-15 -- only about 1/3 the radius of the electron.

Iar tinand cont ca quark-ul este o particula in proton... wink.gif

Am editat mesajul si am adaugat si electronul, cu un "?" - link catre aceasta discutie.


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Olaf
mesaj 25 Nov 2005, 06:44 PM
Mesaj #79


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Ma gandeam la faptul ca pierzand sensul dimensiunii (sunt totusi particule cuantice), se accepta masa ca termen pentru "mare sau mic". Si nu era vorba de electron, ci de neutronul asociat electronului...
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Mihai
mesaj 25 Nov 2005, 06:46 PM
Mesaj #80


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QUOTE
Ma gandeam la faptul ca pierzand sensul dimensiunii (sunt totusi particule cuantice), se accepta masa ca termen pentru "mare sau mic".

In acelasi mod se pierde si sensul de masa...

QUOTE
Si nu era vorba de electron, ci de neutronul asociat electronului...

Unde anume?


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Olaf
mesaj 25 Nov 2005, 06:49 PM
Mesaj #81


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QUOTE
Unde anume?

Ca fiind cea mai mica particula...


Masa se exprima ca energia totala, dupa pricipul E=mc2...

Acest topic a fost editat de Olaf: 25 Nov 2005, 06:49 PM
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Mihai
mesaj 25 Nov 2005, 06:51 PM
Mesaj #82


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QUOTE
Right now, our best evidence says that there are particles inside of neutrons and protons. Scientists call these particles quarks.

brow.gif


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Olaf
mesaj 25 Nov 2005, 06:52 PM
Mesaj #83


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Sa-i zicem electro-neutronul, sau, daca vrei, "electron neutrino". smile.gif Este altceva decat neutronul ala mare si gras din nucleu tongue.gif

Acest topic a fost editat de Olaf: 25 Nov 2005, 06:53 PM
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Mihai
mesaj 25 Nov 2005, 07:03 PM
Mesaj #84


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Ok, am reeditat. tongue.gif


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Mihai
mesaj 15 Sep 2006, 10:44 AM
Mesaj #85


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Luna aceasta Culturalia 5000 implineste 2 ani! smile.gif
Va invit sa va exprimati aici comentariile, criticile, sugestiile voastre referitoare la acest proiect al Hanului.


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Felina
mesaj 15 Sep 2006, 11:16 AM
Mesaj #86


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I love it! wub.gif


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