Chapter 4 Powerpoint
... 1.) Emission Spectrum: All wavelengths of light emitted by an atom. 2.) Absorption Spectrum: All wavelengths of light that are not absorbed by an atom. This is a continuous spectrum with wavelengths removed that are absorbed by the atom. These are shown as black lines for absorbed light. Continu ...
... 1.) Emission Spectrum: All wavelengths of light emitted by an atom. 2.) Absorption Spectrum: All wavelengths of light that are not absorbed by an atom. This is a continuous spectrum with wavelengths removed that are absorbed by the atom. These are shown as black lines for absorbed light. Continu ...
Lecture 13: Heisenberg and Uncertainty
... Problem: According to the wave picture of light, the incident X-ray should give up some of its energy to the electron, and emerge with a lower energy (i.e., the amplitude is lower), but should have ...
... Problem: According to the wave picture of light, the incident X-ray should give up some of its energy to the electron, and emerge with a lower energy (i.e., the amplitude is lower), but should have ...
2 Particle Annihilation and Creation
... and neutrons in a nucleus (smaller scale) requires a few MeV since the nucleus is a more strongly bound structure. It turns out that protons and neutrons are made up of quarks which are more tightly bound still. Hence energies in the GeV range (109 eV) are required to investigate such fine detail an ...
... and neutrons in a nucleus (smaller scale) requires a few MeV since the nucleus is a more strongly bound structure. It turns out that protons and neutrons are made up of quarks which are more tightly bound still. Hence energies in the GeV range (109 eV) are required to investigate such fine detail an ...
The Quantum Model of the Atom
... • Proposed a model of the hydrogen atom that linked the atom’s electron with photon emission • Electron can circle the nucleus only in allowed paths, orbits • Electron can neither gain nor lose energy • “the single electron of hydrogen orbits the nucleus only in allowed orbits, each with a fixed ene ...
... • Proposed a model of the hydrogen atom that linked the atom’s electron with photon emission • Electron can circle the nucleus only in allowed paths, orbits • Electron can neither gain nor lose energy • “the single electron of hydrogen orbits the nucleus only in allowed orbits, each with a fixed ene ...
Topic 7: Atomic and nuclear physics 7.1 The atom
... with a specific number of protons and neutrons) but only about 300 of them are stable, the rest are unstable. • As the number of protons in the nucleus increases the electrostatic repulsion between them grows, but the strong nuclear force does not grow proportionally since it is a short range force. ...
... with a specific number of protons and neutrons) but only about 300 of them are stable, the rest are unstable. • As the number of protons in the nucleus increases the electrostatic repulsion between them grows, but the strong nuclear force does not grow proportionally since it is a short range force. ...
Electrons Circulating a Nucleus
... Atoms with •(+5 and -4)=+1 (extra proton) •(+5 and -6)= -1 (extra electron) ...
... Atoms with •(+5 and -4)=+1 (extra proton) •(+5 and -6)= -1 (extra electron) ...
Line Spectra and the Bohr Model
... Line Spectra and the Bohr Model Limitations of the Bohr Model • Can only explain the line spectrum of hydrogen adequately. • Can only work for (at least) one electron atoms. • Cannot explain multi-lines with each color. • Electrons are not completely described as small particles. • Electrons can ha ...
... Line Spectra and the Bohr Model Limitations of the Bohr Model • Can only explain the line spectrum of hydrogen adequately. • Can only work for (at least) one electron atoms. • Cannot explain multi-lines with each color. • Electrons are not completely described as small particles. • Electrons can ha ...
Higgs - Transcript - the Cassiopeia Project
... But Quantum Mechanics rejects the notion of continuous. And so… fields became distributions of tiny field particles. And the strength of the field at any given point was nothing but the density or quantity of field particles at that point. These particles are called virtual particles, because they v ...
... But Quantum Mechanics rejects the notion of continuous. And so… fields became distributions of tiny field particles. And the strength of the field at any given point was nothing but the density or quantity of field particles at that point. These particles are called virtual particles, because they v ...
Document
... Since (differently from electric charges) one has only one sign of the mass, the lowest moment is the 4-pole. ...
... Since (differently from electric charges) one has only one sign of the mass, the lowest moment is the 4-pole. ...
Lecture 33: Quantum Mechanical Spin
... particles have an additional internal degree of freedom, called ‘spin’ • The Stern-Gerlach experiment (1922): ...
... particles have an additional internal degree of freedom, called ‘spin’ • The Stern-Gerlach experiment (1922): ...
Lecture 4
... Now, we need to include spin in our description. Electrons have spin antisymmetric. ...
... Now, we need to include spin in our description. Electrons have spin antisymmetric. ...
Particle accelerator goes boldly where none have gone before
... Higgs particle. Without the Higgs, the standard model would predict that all particles have zero mass (or heaviness), which is obviously not true. The LHC is energetic enough to find the Higgs particle if it exists. Thus if the Higgs is not discovered, the standard model falls apart and, as one CERN ...
... Higgs particle. Without the Higgs, the standard model would predict that all particles have zero mass (or heaviness), which is obviously not true. The LHC is energetic enough to find the Higgs particle if it exists. Thus if the Higgs is not discovered, the standard model falls apart and, as one CERN ...
+1/2
... range of energies even though the total energy available is the same. Pauli proposed that there is a third, undetected (hence neutral), particle which shares the energy and balances the momentum. ...
... range of energies even though the total energy available is the same. Pauli proposed that there is a third, undetected (hence neutral), particle which shares the energy and balances the momentum. ...
Nuclear Forces and Quarks
... into a proton. In β+ decay, the spin goes from “up” to “down,” which turns a proton into a neutron. Because of the law of conservation of charges (the total charge has to be the same before and after any change), any change that produces a positive charge has to also produce a negative charge. The w ...
... into a proton. In β+ decay, the spin goes from “up” to “down,” which turns a proton into a neutron. Because of the law of conservation of charges (the total charge has to be the same before and after any change), any change that produces a positive charge has to also produce a negative charge. The w ...
quantum mechanical model
... energy of atoms changes when the atom absorbs or emits light. • Stated that the electrons orbit the nucleus like planets orbit the Sun. ...
... energy of atoms changes when the atom absorbs or emits light. • Stated that the electrons orbit the nucleus like planets orbit the Sun. ...
Power Point - Quantum Theory - Dr. Gupta`s Professional Page
... • Einstein proposed that particles of light are really photons (packets of light energy) and deduced that Ephoton = h • Only light with a frequency of photons such that h equals the energy that binds the electrons in the metal is sufficiently energetic to eject electrons. (Threshold frequency) • I ...
... • Einstein proposed that particles of light are really photons (packets of light energy) and deduced that Ephoton = h • Only light with a frequency of photons such that h equals the energy that binds the electrons in the metal is sufficiently energetic to eject electrons. (Threshold frequency) • I ...
Frank-Herze experiment with Neon
... up at a somewhat greater distance, and the collector electrode A is set up next to it. The cathode is heated indirectly, in order to prevent a potential differential along K. Electrons are emitted by the hot electrode and form a charge cloud. These electrons are attracted by the driving potential U1 ...
... up at a somewhat greater distance, and the collector electrode A is set up next to it. The cathode is heated indirectly, in order to prevent a potential differential along K. Electrons are emitted by the hot electrode and form a charge cloud. These electrons are attracted by the driving potential U1 ...
Document
... 2. EM radiation are forms of energy which move through space as waves a. Move at speed of light (c) 3.00 x 108 m/s b. Speed is equal to the frequency times the wavelength c = νλ Frequency (ν) (greek letter – nu) is the number of waves passing a given point in one second ...
... 2. EM radiation are forms of energy which move through space as waves a. Move at speed of light (c) 3.00 x 108 m/s b. Speed is equal to the frequency times the wavelength c = νλ Frequency (ν) (greek letter – nu) is the number of waves passing a given point in one second ...
Electron scattering
Electron scattering occurs when electrons are deviated from their original trajectory. This is due to the electrostatic forces within matter interaction or, if an external magnetic field is present, the electron may be deflected by the Lorentz force. This scattering typically happens with solids such as metals, semiconductors and insulators; and is a limiting factor in integrated circuits and transistors.The application of electron scattering is such that it can be used as a high resolution microscope for hadronic systems, that allows the measurement of the distribution of charges for nucleons and nuclear structure. The scattering of electrons has allowed us to understand that protons and neutrons are made up of the smaller elementary subatomic particles called quarks.Electrons may be scattered through a solid in several ways:Not at all: no electron scattering occurs at all and the beam passes straight through.Single scattering: when an electron is scattered just once.Plural scattering: when electron(s) scatter several times.Multiple scattering: when electron(s) scatter very many times over.The likelihood of an electron scattering and the proliferance of the scattering is a probability function of the specimen thickness to the mean free path.