Teacher guide Teacher guide: Turning Points in Physics
... important experimental work by Thomson and Millikan. Further work on electron beams led to support for relativity and the discovery of electron diffraction. Recent 'Millikan' experiments have unsuccessfully sought evidence for fractional charge. The section on wave particle duality follows the chang ...
... important experimental work by Thomson and Millikan. Further work on electron beams led to support for relativity and the discovery of electron diffraction. Recent 'Millikan' experiments have unsuccessfully sought evidence for fractional charge. The section on wave particle duality follows the chang ...
Complete the following statement: When a glass rod is rubbed with
... 21.3.4. Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphe ...
... 21.3.4. Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphe ...
The Aharonov-Bohm Magnetic Field is Not Zero and the Electron Spirals
... solenoid of radius a , that generates along its axis a uniform Magnetic Induction B , then, the Magnetic Induction at the electron vanishes. And the electron is affected by the Nonzero Magnetic Potential that appears in Schrödinger’s ...
... solenoid of radius a , that generates along its axis a uniform Magnetic Induction B , then, the Magnetic Induction at the electron vanishes. And the electron is affected by the Nonzero Magnetic Potential that appears in Schrödinger’s ...
Attenuation of gamma particles
... interacted with an electron, it was removed. The gamma is removed when the process photo-absorption, but if Compton scattering occurs the gamma has not been absorbed. In Compton scattering, the gamma particle is scattered out of the beam with a lower energy. Thus, I(x) in Lambert’s law refers to the ...
... interacted with an electron, it was removed. The gamma is removed when the process photo-absorption, but if Compton scattering occurs the gamma has not been absorbed. In Compton scattering, the gamma particle is scattered out of the beam with a lower energy. Thus, I(x) in Lambert’s law refers to the ...
Particle Nature of Matter
... orbiting a single proton. It should hold the key to atomic physics. ...
... orbiting a single proton. It should hold the key to atomic physics. ...
g 2 - Desy
... MUED: g1 is a dark matter candidate KK level 2 bosons are like Z’ bosons Further studies are needed (resolution power …) Sensitivity of ILC for level 2 KK bosons: ~2√s ILC has a good chance for detection LHC: sensitivity up to 1/R~1.5 TeV ...
... MUED: g1 is a dark matter candidate KK level 2 bosons are like Z’ bosons Further studies are needed (resolution power …) Sensitivity of ILC for level 2 KK bosons: ~2√s ILC has a good chance for detection LHC: sensitivity up to 1/R~1.5 TeV ...
ppt
... The majority of silicon detectors consist of n type bulk material. The back face has an aluminium contact over the complete surface. The front face has p type silicon strips implanted in the surface. These p type strips aluminium strips on their surface. The aluminium strips are separated from their ...
... The majority of silicon detectors consist of n type bulk material. The back face has an aluminium contact over the complete surface. The front face has p type silicon strips implanted in the surface. These p type strips aluminium strips on their surface. The aluminium strips are separated from their ...
Wednesday, Sept. 7, 2005
... can exert on the molecule? (b) What is the potential energy when the torque is at its maximum? (c) In what position will the potential energy take on its greatest value? Why is this different than the position where the torque is maximized? (a) The torque is maximized when =90 degrees. Thus the mag ...
... can exert on the molecule? (b) What is the potential energy when the torque is at its maximum? (c) In what position will the potential energy take on its greatest value? Why is this different than the position where the torque is maximized? (a) The torque is maximized when =90 degrees. Thus the mag ...
SUPERSYMETRY FOR ASTROPHYSICISTS
... for new particle physics • Generic properties vs. special models (What do these shaded regions mean?) • Direct implications for astrophysics 30 Jul – 1 Aug 07 ...
... for new particle physics • Generic properties vs. special models (What do these shaded regions mean?) • Direct implications for astrophysics 30 Jul – 1 Aug 07 ...
Slide 1
... • Electrostatics- Physics that deals with the attractions and repulsions of electrical charges not dependent on their motion. (Electricity at rest) ...
... • Electrostatics- Physics that deals with the attractions and repulsions of electrical charges not dependent on their motion. (Electricity at rest) ...
Ch16_2008
... •Field thus points toward a negative charge and away from a positive charge •Since test charge is positive, the direction of the electric field is the direction of the force felt by a positive charge •If there are two or more charges creating the field then the field at any point is the vector sum o ...
... •Field thus points toward a negative charge and away from a positive charge •Since test charge is positive, the direction of the electric field is the direction of the force felt by a positive charge •If there are two or more charges creating the field then the field at any point is the vector sum o ...
Lepton
A lepton is an elementary, half-integer spin (spin 1⁄2) particle that does not undergo strong interactions, but is subject to the Pauli exclusion principle. The best known of all leptons is the electron, which is directly tied to all chemical properties. Two main classes of leptons exist: charged leptons (also known as the electron-like leptons), and neutral leptons (better known as neutrinos). Charged leptons can combine with other particles to form various composite particles such as atoms and positronium, while neutrinos rarely interact with anything, and are consequently rarely observed.There are six types of leptons, known as flavours, forming three generations. The first generation is the electronic leptons, comprising the electron (e−) and electron neutrino (νe); the second is the muonic leptons, comprising the muon (μ−) and muon neutrino (νμ); and the third is the tauonic leptons, comprising the tau (τ−) and the tau neutrino (ντ). Electrons have the least mass of all the charged leptons. The heavier muons and taus will rapidly change into electrons through a process of particle decay: the transformation from a higher mass state to a lower mass state. Thus electrons are stable and the most common charged lepton in the universe, whereas muons and taus can only be produced in high energy collisions (such as those involving cosmic rays and those carried out in particle accelerators).Leptons have various intrinsic properties, including electric charge, spin, and mass. Unlike quarks however, leptons are not subject to the strong interaction, but they are subject to the other three fundamental interactions: gravitation, electromagnetism (excluding neutrinos, which are electrically neutral), and the weak interaction. For every lepton flavor there is a corresponding type of antiparticle, known as antilepton, that differs from the lepton only in that some of its properties have equal magnitude but opposite sign. However, according to certain theories, neutrinos may be their own antiparticle, but it is not currently known whether this is the case or not.The first charged lepton, the electron, was theorized in the mid-19th century by several scientists and was discovered in 1897 by J. J. Thomson. The next lepton to be observed was the muon, discovered by Carl D. Anderson in 1936, which was classified as a meson at the time. After investigation, it was realized that the muon did not have the expected properties of a meson, but rather behaved like an electron, only with higher mass. It took until 1947 for the concept of ""leptons"" as a family of particle to be proposed. The first neutrino, the electron neutrino, was proposed by Wolfgang Pauli in 1930 to explain certain characteristics of beta decay. It was first observed in the Cowan–Reines neutrino experiment conducted by Clyde Cowan and Frederick Reines in 1956. The muon neutrino was discovered in 1962 by Leon M. Lederman, Melvin Schwartz and Jack Steinberger, and the tau discovered between 1974 and 1977 by Martin Lewis Perl and his colleagues from the Stanford Linear Accelerator Center and Lawrence Berkeley National Laboratory. The tau neutrino remained elusive until July 2000, when the DONUT collaboration from Fermilab announced its discovery.Leptons are an important part of the Standard Model. Electrons are one of the components of atoms, alongside protons and neutrons. Exotic atoms with muons and taus instead of electrons can also be synthesized, as well as lepton–antilepton particles such as positronium.