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Anonymous users2024-02-07Elementary Particle Classification Characteristic Family Charge Mass (Note) Average Life (S) Common Decay Products Antiparticle Lepton Stable - e+ve00 stable - v-ev 00 stable - v- baryon p+stable——,n 0 - n + less than 10 -14 , radiation + meson + radiation 0k++, 0k+ (fast decay mode) ,0 (slow decay mode) +v- ,ev-, v -,e+v k0 (antiparticle) decay in the same way as k0 - k0 , 0 + radiation Note: The mass of the particles in the table is given in the unit of energy 1mev (megaelectron volt). If compared to everyday units, 1MEV is equivalent to working at 1kW of power.
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Anonymous users2024-02-061) Quark family. It consists of a total of 6 different types of quarks, which are the smallest particles that make up the nucleus or subnuclear particles.
2) Leptonic family. It includes a total of 6 different types of leptons. The electron we are familiar with is a member of the lepton family.
3) A family of particles that transmit force. Among them are gluons that transmit strong or nuclear forces, photons that transmit electromagnetic forces, and intermediate bosons and z° particles that transmit weak forces.
4) Antiparticle family. It refers to the fact that for each type of particle in quarks and leptons there is a corresponding antiparticle, which is characterized by having the same mass as the original particle but carrying the opposite charge.
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Anonymous users2024-02-05Elementary particles in quantum mechanics are the most basic units that make up matter. Depending on the force, particles are divided into three categories: hadrons, leptons, and propagators.
1. Hadron is the general term for all particles involved in the action of strong force. They are made up of quarks, and there are five types of quarks that have been discovered, and they are: upper quarks, lower quarks, singular quarks, quarks, and bottom quarks.
Theories predict the existence of a sixth quark, named the top quark, but has not yet been discovered. The vast majority of existing particles are hadrons, and protons, neutrons, and mesons all belong to hadrons. Lepton is a general term for particles that only participate in the action of weak force, electromagnetic force and gravitational force, but do not participate in strong interactions;
2. There are six types of leptons, including electrons, electron neutrinos, electrons, sub-neutrinos, sub-neutrinos, sub-neutrinos. Electrons, subons, and subons are charged, and all neutrinos are not charged; The proton is an important particle discovered in 1975, which does not participate in the strong action and belongs to the lepton, but its mass is very heavy, which is 3600 times that of the electron and the times of the proton, so it is also called the heavy lepton;
3. Propagators also belong to elementary particles. There are a total of 8 kinds of gluons that transmit strong effects, and they were indirectly discovered in 1979 in the three-injection phenomenon, and they can form gluon balls, but they have not been directly observed so far. Passes weak action w+, w- and z0
The middle boson, discovered in 1983, is very heavy, 80-90 times that of a proton.
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Anonymous users2024-02-04The owner asks what elementary particles are. No, there are several types of elementary particles. What is elementary particle: it is the various particles that make up matter that cannot be divided in any way. It's called elementary particles.
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Anonymous users2024-02-03There are more than 30 kinds of elementary particles that have been discovered, and there are more than 300 kinds of resonance states with them.
2) Description. According to the interaction between elementary particles, they can be divided into three categories:
a.Hadrons...Only one photon has been found now.
Elementary particles are mostly unstable, decay in a short period of time, and can transform into each other.
According to the current understanding of the structure of the particle world, according to the standard model, the particle world is composed of 62 kinds of particles, of which 60 kinds have been confirmed by experiments, and there are 2 kinds of evidence of their existence that have not been observed in experiments, which is the limit of segmentation at this stage. >>>More
It is based on the basic belief that every student has the potential to learn art and can achieve different degrees of development in their different potentials. Stimulate students' interest in learning, interest is one of the basic driving forces for learning art, and the process of art learning activities can bring happiness to students. As a result of learning art, students will enjoy the activity from the bottom of their hearts if they gain a sense of satisfaction and success.
Knife work is a basic skill necessary for a chef, and it is also an important criterion to test whether a chef is qualified and excellent. For a chef, the skill of the knife affects not only the sight of the dish, but also the taste of the dish. To be a good chef, you must have skilled knife skills and be able to use the right thickness and fineness. >>>More
Hand tools are used to perform various machining of workpieces on vices and platforms, and sometimes to repair equipment. The basic operations include marking, filing, sawing, chiseling, drilling, countersinking, reaming, reaming, tapping, threading, riveting, straightening, bending, grinding, measuring, assembling and commissioning, simple heat treatment, oil painting, etc.
Chess is a competitive sport in which two players play against each other. There are 32 pieces in total, divided into two groups, red and black, with 16 pieces each, and each side of the game holds one group. The types of chess pieces are described in the following table: >>>More