what are the masses of the up and down quarks?
345394
Up: About 4 MeV\nDown: About 8 MeV\n\nThese should be compared to the mass of a proton: 938 MeV. Most of the mass of a proton is the energy of the interaction of the quarks, not the quarks themselves.
1037035
for ur g.k. Tachyons travel at v > c. (always)\n\nalso mass m as given in modern physics \nm         = \nm0 \n              --------------          \n             sqrt (1 -  v^2/ c^2 )\n\nv is velocity, m0 is rest mass (mass at v=0)\n\nas per ur quest\n\nlet us subs v = c\n\nthus m = m0 / 1 - 1\n=m0 / 0\n= infinity\n\nalso \nt = t0 / sqrt ( 1 - v^2/c^2)\n\nif v> c    t becomes -ve.   v get into past.\n\n\nall this is still in theory though
194230
Between the electron and photon, photons will be smaller and lighter. But to counter it, there are actually even smaller things called quarks found in the electron and proton. These are REALLY small and each electron contains THREE of them, so u can imagine how small there are.
730167
Very close to the mass of a proton.  It is about 1.6749 x 10^-27 kg, 1 u, or 939.57 MeV/c^2.
296566
By using particle collisions, it is possible to show that there is *something* inside of protons, for example. These 'somethings' have the properties that the theorists predict that quarks will have. Furthermore, the theoretical predictions made by the quark models (such as decay rates, reaction cross sections, etc) are in agreement with what is actually seen in the accelerators. This is why we say that quarks exist even though nobody has seen an isolated quark (and there are good theoretical reasons why we may never see one).\n\nOn the other hand, the strings in string theory are *incredibly* small, which means we need very high energies to probe them. No particle accelerator that we have right now will produce these energies. Also, the strings are what would describe the nature of the quarks, not show they don't exist. The question is whether they are point particles or extended to some (small!) degree.
375283
The quark hasn't yet been split, so noone knows what they are made of. It is possible that quarks aren't made of smaller particles.
507428
The proton is made up of 3 quarks; 2 up, 1 down.
12845
Protons and Neutrons can be divided into quarks, but electrons are not divisble as far as we know.
80973
They are real particles.  They really exist.  The two types are mesons and baryons.  Mesons are made of one quark and an anti-quark.  Solid matter we touch in every day life is made up of atoms made of protons, neutrons, and electrons.  Protons and neutrons are two kinds of hadrons called baryons, made up from the same particles (quarks) that make up mesons, except protons and neutrons are made up of 3 quarks.  Unlike protons and neutrons, mesons are unstable, so they quickly decay.  But they can be produced and studied in particle colliders, such as the Tevatron at Fermilab, and other big colliders at the Stanford Linear Accelerator Collider (SLAC), and at Cornell.  Have a look at the following websites for more info:\n\nhttp://www2.slac.stanford.edu/vvc/theory/hadrons.html\nhttp://www.fnal.gov\nhttp://www.slac.stanford.edu
464300
Neutrons are made of quarks, yes. As are protons/neutrons (which are just positive/negative neutrons).
931511
Elements are made up of atoms.\nAtoms are made up of protons, neutrons, and electrons.\nProtons, Neutrons and electrons are made up of 6 different types of quarks: up, down, strange, bottom, top, and charm.\n\ncheck out this link: http://en.wikipedia.org/wiki/Quark
95148
Actually, the mass of a proton is 1.00727664669 atomic mass units.\n\nAn atomic mass unit is defined such that Carbon 12 is exactly 12.  The carbon atom weighs less than 12 times the proton (because of nuclear binding energy).
307876
I got a combined mass of ~11 solar masses.  The masses of the individual components of course, would be impossible to tell from the information given alone.
103375
You know, this is so easy to answer with a simple web search that I somewhat annoyed that you bothered to ask it here. Do you not know how to use google or yahoo or altavista?\n\nThese two postulated but undiscovered particles are completely different and have completely different properties. For example:\n\nThe postulated Higgs Boson produces mass.\nThe postulated graviton transmits gravitational force between things with mass.\n\nThe Higgs Boson has spin 0.\nThe graviton has spin 2. \n\nThe Higgs Boson has a nonzero rest mass. \nThe graviton has a rest mass of zero. \n \n\nAnd so on.
401330
Quarks are fundamental subatomic particles. Your and my school physics probably stopped at electrons protons and neutrons, but leptons and quarks are now widely regarded as "more fundamental" i.e. the building blocks out of which protons and electrons and neutrons (known collectively as hadrons) are built.\n\nAs you might expect if there is a top quark, there is a bottom quark, too. In fact there are six types of quark in all. With various properties ...\n\nEach quark is assigned a baryon number, B  =  1/3, and a vanishing lepton number L  =  0. They have fractional electric charge, Q, either Q  =  +2/3 or Q  =  −1/3. The former are called up-type quarks, the latter, down-type quarks. \n\nEach quark is assigned a weak isospin: Tz  =  +1/2 for an up-type quark and Tz  =  −1/2 for a down-type quark. Each doublet of weak isospin defines a generation of quarks. There are three generations, and hence six flavours of quarks — the up-type quark flavours are up, charm and top; the down-type quark flavours are down, strange, and bottom (each list is in the order of increasing mass).\n\nThe fractional electric charges are worth a comment.\n\nAs you know electrons have a charge of -1 and protons a charge of + 1. This means that electrons contain three quarks with Q = -1/3 and protons contain three quarks, two of them having Q = +2/3 and one of them having Q - -1/3. And neutrons (charge 0) contain 3 quarks, one of them having Q = +2/3, and two of them having Q = -1/3\n\nQuarks are not seen in isolation as separate entities, they are contained within (or "confined" to) the hadrons of which they are part.
95898
The most fundamental particles known to exist at the moment are quarks and leptons. Quarks are the things the make up the pieces of the nucleus in an atom and leptons include things like electrons.\n\nWithin a nucleus you will have heard of Protons and Neutrons ro collectively Nucleons. Well a quark is a sub unit of one of these so called "Nucleons". There are three quarks to every nucleon. There are many types of quark and these create many types of particles, most of which are extremely shortlived. You can learn more about the world of Particle Physics in the Particle Physics Adventure.\n\nhttp://particleadventure.org/particleadventure/
809710
is you mean mass spectroscopy.. try this link...