Subatomic Particles
Having a size smaller than the size of an atom, which is about one angstrom, or 10^-10 meters.
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Subatomic particles fall into two classes, based on their statistical behaviour. Those particles to which the Pauli exclusion principle applies are called fermions; those that do not obey this principle are called bosons.
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Materials needed: large plastic easter eggs, enough for one per student, or one per group. gumballs or m&ms of two different colors tic tacs ping pong balls (same amount as easter eggs) ...
One of the subatomic particles from which many modern theoreticians believe such elementary particles as protons and neutrons are composed. The various kinds of quarks have positive or negative charges of 1/3 or 2/3.
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HADRON - Subatomic particles that are composed of quarks and which are acted on by the strong nuclear force. Hadrons may be subdivided into mesons and baryons. Mesons consist of quark-antiquark pairs, whereas, baryon are made of three quarks.
baryons Heavy subatomic particles, such as protons and neutrons, that make up the nuclei of atoms.
Discovery of subatomic particles
Atoms were thought to be the smallest possible division of matter until 1897 when J.J. Thomson discovered the electron
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Quarks are subatomic particles that may be the fundamental constituents of baryons (like protons and neutrons) and mesons (like pions and kaons). Quarks have mass, charge (plus or minus 1/3 or 2/3), and spin.
(a) Hypothetical subatomic particles that move slowly compared with the speed of light.
(b) Any dark matter candidate which was non-relativistic at the point of decoupling.
Leptons are subatomic particles that are susceptible to the weak nuclear force but not the strong force (the force that binds an atomic nucleus together).
secondary emission Emission of subatomic particles or photons stimulated by primary radiation; for example, cosmic rays impinging on other particles and causing them, by disruption of their electron configurations or even of their nuclei, ...
electron volt (Space Flight Glossary - JPL) A measure of the energy of subatomic particles. electron volt (NASA SP-7, 1965) (abbr eV) ...
Remarkably, quantum theory typically permits only probable or statistical calculation of the observed features of subatomic particles, understood in terms of wavefunctions.
Only subatomic particles existed"not only the protons, neutrons and electrons we know today, but also, we think, various strange and exotic elementary particles predicted by current theory.
(a) A machine for speeding subatomic particles to high velocity, then colliding them with a stationary target or with another beam of particles moving in the opposite direction.
These ghostly subatomic particles are released by nuclear reactions in the Sun's core. They then pass directly through the Sun and out into space.
By creating a soup of subatomic particles similar to what the Big Bang produced, scientists have discovered the temperature boundary where ordinary matter dissolves.
There are two main groups of subatomic particles: leptons (elementary particles that are not made up of other smaller particles) and hadrons (which are made up of smaller subatomic particles called quarks).
Made almost entirely of neutrons (subatomic particles with no electric charge), these stellar corpses pack about twice as much mass as there is in the Sun into a sphere only about 10 kilometers across.
Although the name would suggest that cosmic rays are some form of electromagnetic radiation, they are actually subatomic particles travelling at significant fractions of the speed of light.
Atomic theory, for example, implies that a granite boulder which appears a heavy, hard, solid, grey object is actually a combination of subatomic particles with none of these properties, ...
whose research paper has been published in Europhysics Letters, believes that while trying to solve this problem, scientists have neglected an important factor; the impact of the rotation of our Galaxy and its influence on how subatomic particles ...
Definition: wave-particle duality: The principle of quantum mechanics which implies that light (and, indeed, all other subatomic particles) sometimes act like a wave, and sometimes act like a particle, ...
universe was created in a gigantic explosion and that the various elements observed today were produced within the first few minutes after the big bang, when the extremely high temperature and density of the universe would fuse subatomic particles ...
For several hundred thousand years immediately thereafter, the universe was too hot for elements to form, so it consisted of a mix of subatomic particles and radiation.
Alvarez won the 1968 Nobel prize for physics for work that included the discovery of resonance particles-subatomic particles that have very short lifetimes and that occur only in high-energy nuclear collisions.
The principle of quantum mechanics which implies that light (and, indeed, all other subatomic particles) sometimes act like a wave, and sometimes act like a particle, depending on the experiment you are performing.
Neutron stars, which are created in some supernovae, are so dense because the electrons and protons that form normal matter have been squeezed into neutrons and other exotic subatomic particles.
is actually a combination of subatomic particles with none of these properties, moving very rapidly in an area consisting mostly of empty space.
When a massive star explodes, it leaves behind some sort of compact object, either a city-sized ball of subatomic particles called a neutron star, or a black hole. The outcome depends on the mass of the progenitor star.
the stream of charged subatomic particles emanating from the sun
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The galaxy, dubbed Speca by the researchers, is only the second spiral, as opposed to elliptical, galaxy known to produce large, powerful jets of subatomic particles moving at nearly the speed of light.
These subatomic particles emit electromagnetic radiation, including radio waves, visible light, X-rays, and gamma rays, such as that as the pulsar rotates they appear to "pulse" with light to an observer.
Beginning with a giant star collapsing on itself or the collision of two neutron stars, waves of radiation and subatomic particles are propelled outward from the nascent black hole and collide with one another, releasing the gamma radiation.
Both the hydrogen quadruplet and the helium are composed of essentially the same number of subatomic particles. Yet the helium weighs less. Third, Albert Einstein's new theory of relativity showed that matter can be converted into energy (E=mc2).
the protons, electrons, and neutrons or differences in the strengths of the fundamental forces of natures from that observed on the Earth would produce noticable changes in the spacing and strength of the spectral lines. If the subatomic particles ...
 See also: Light, Energy, Earth, Solar, Mass
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