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They are subatomic particles that help hold the nucleus of an atom together. They are a form of matter, rather than anti-matter.
Quarks
Quarks are extremely small particles (less than 10-15 m radius) that participate in the strong nuclear force. Isolated (single) quarks have never been found, probably because they combine with each other so quickly. Quarks also have fractional electric charges. They are classified as follows:
* down (d) - charge = -1/3
* up (u) - charge = +2/3
* strange (s) - charge = -1/3
* charm (c) - charge = +2/3
* bottom (b) - charge = -1/3
* top (t) - charge = +2/3 (most massive, discovered in 1995)
As of now, quarks are thought to be the most fundamental particles.
http://www.youtube.com/watch?v=TGrDj5vFefQ
Quarks
Quarks are extremely small particles (less than 10-15 m radius) that participate in the strong nuclear force. Isolated (single) quarks have never been found, probably because they combine with each other so quickly. Quarks also have fractional electric charges. They are classified as follows:
* down (d) - charge = -1/3
* up (u) - charge = +2/3
* strange (s) - charge = -1/3
* charm (c) - charge = +2/3
* bottom (b) - charge = -1/3
* top (t) - charge = +2/3 (most massive, discovered in 1995)
As of now, quarks are thought to be the most fundamental particles.
http://www.youtube.com/watch?v=TGrDj5vFefQ
Quarks are what make up electrons, protons, and neutrons and give them their mass.
Hii
A quark is a fundamental particle which possesses both electric charge and 'strong' charge. They combine in groups of two or three to form composite objects (called mesons and baryons, respectively), held together by the strong force. Protons and neutrons are familiar examples of such composite objects -- both are made up of three quarks.
The quarks come in six different species (physicists call them 'flavors'), each of which have a unique mass. The two lightest, unimaginatively called 'up' and 'down' quarks, combine to form protons and neutrons. The heavier quarks aren't found in nature and have so far only been observed in particle accelerators.
How do we know they exist? At first many physicists felt they were no more than fictitious entities invented to make certain particle physics calculations easier (legend has it that Murray Gell-Mann took the name from a word in James Joyce's 'Finnegan's Wake'). However, particle physics experiments over the last thirty years have proven otherwise. When protons and neutrons are struck with particles that truly are fundamental (like electrons, neutrinos, photons, etc.) the protons and neutrons reveal their structure in the way the colliding particle rebounds. This is analogous to the way Rutherford discovered the nucleus within the atom by bombarding gold with radiation. The results of these experiments show that the proton, for example, is composed of three fundamental objects with just the right properties to be the postulated 'quarks' of Gell-Mann. Furthermore, the theory that describes the interactions of quarks with each other also predicts the properties of the composite objects they form. These predictions have been proven to be correct, allowing us to develop a 'periodic table' of the known baryons and mesons -- another spectacular success of the quark theory.
According to : http://www.physlink.com/Education/AskExperts/ae134.cfm
A quark is a fundamental particle which possesses both electric charge and 'strong' charge. They combine in groups of two or three to form composite objects (called mesons and baryons, respectively), held together by the strong force. Protons and neutrons are familiar examples of such composite objects -- both are made up of three quarks.
The quarks come in six different species (physicists call them 'flavors'), each of which have a unique mass. The two lightest, unimaginatively called 'up' and 'down' quarks, combine to form protons and neutrons. The heavier quarks aren't found in nature and have so far only been observed in particle accelerators.
How do we know they exist? At first many physicists felt they were no more than fictitious entities invented to make certain particle physics calculations easier (legend has it that Murray Gell-Mann took the name from a word in James Joyce's 'Finnegan's Wake'). However, particle physics experiments over the last thirty years have proven otherwise. When protons and neutrons are struck with particles that truly are fundamental (like electrons, neutrinos, photons, etc.) the protons and neutrons reveal their structure in the way the colliding particle rebounds. This is analogous to the way Rutherford discovered the nucleus within the atom by bombarding gold with radiation. The results of these experiments show that the proton, for example, is composed of three fundamental objects with just the right properties to be the postulated 'quarks' of Gell-Mann. Furthermore, the theory that describes the interactions of quarks with each other also predicts the properties of the composite objects they form. These predictions have been proven to be correct, allowing us to develop a 'periodic table' of the known baryons and mesons -- another spectacular success of the quark theory.
According to : http://www.physlink.com/Education/AskExperts/ae134.cfm
Quarks (pronounced /kwɔrks/ or /kwɑrks/) are a type of elementary particle and major constituents of matter.Quarks (pronounced /kwɔrks/ or /kwɑrks/) are a type of elementary particle and major constituents of matter.
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