Monday, Sept. 23, 2013
... Current passing through a filament produces copious numbers of electrons by thermionic emission. These electrons are focused by the cathode structure into a beam and are accelerated by potential differences of thousands of volts until they impinge on a metal anode surface, producing x rays by bremss ...
... Current passing through a filament produces copious numbers of electrons by thermionic emission. These electrons are focused by the cathode structure into a beam and are accelerated by potential differences of thousands of volts until they impinge on a metal anode surface, producing x rays by bremss ...
On the radiation by a charge in a material medium
... throughout this work J1. = 1, with J' the magnetic permeability). This phenomenon, known as the Cherenkov effect, is of great importance in high energy physics where it is used to determine the velocity of elementary particles. Owing to its usefulness this effect is discussed in several texts of ele ...
... throughout this work J1. = 1, with J' the magnetic permeability). This phenomenon, known as the Cherenkov effect, is of great importance in high energy physics where it is used to determine the velocity of elementary particles. Owing to its usefulness this effect is discussed in several texts of ele ...
Quantization of Charge, Light, and Energy
... We have no right to assume that any physical laws exist, or if they have existed up until now, or that they will continue to exist in a similar manner in the future. An important scientific innovation rarely makes its way by gradually winning over and converting its opponents. What does happen is th ...
... We have no right to assume that any physical laws exist, or if they have existed up until now, or that they will continue to exist in a similar manner in the future. An important scientific innovation rarely makes its way by gradually winning over and converting its opponents. What does happen is th ...
Physics 12 Notes Modern Physics Learning Outcomes (Students will
... should spiral into the nucleus, travelling faster and faster as they do so, because of their increasing centripetal acceleration; the electromagnetic radiation they emit should move to higher and higher frequencies until at the point when the electron collides with the nucleus; this radiation is in ...
... should spiral into the nucleus, travelling faster and faster as they do so, because of their increasing centripetal acceleration; the electromagnetic radiation they emit should move to higher and higher frequencies until at the point when the electron collides with the nucleus; this radiation is in ...
ph507-16-2rad2
... When X-rays and gamma-rays are considered, we’ll talk about the more general process of Compton scattering (heating the electrons) and inverse Compton cooling. Cyclotron and Synchrotron Radiation: When magnetic fields are present, charges can interact with them and radiate or absorb radiation. For s ...
... When X-rays and gamma-rays are considered, we’ll talk about the more general process of Compton scattering (heating the electrons) and inverse Compton cooling. Cyclotron and Synchrotron Radiation: When magnetic fields are present, charges can interact with them and radiate or absorb radiation. For s ...
The development of Physics and Modern Physics
... electromotive force that could continue to drive electrically charged particles had to await the development of the chemical battery by the Italian physicist Alessandro Volta in 1800. The classical theory of a simple electric circuit assumes that the two terminals of a battery are maintained positiv ...
... electromotive force that could continue to drive electrically charged particles had to await the development of the chemical battery by the Italian physicist Alessandro Volta in 1800. The classical theory of a simple electric circuit assumes that the two terminals of a battery are maintained positiv ...
Physics - USM-Rocks
... electromotive force that could continue to drive electrically charged particles had to await the development of the chemical battery by the Italian physicist Alessandro Volta in 1800. The classical theory of a simple electric circuit assumes that the two terminals of a battery are maintained positiv ...
... electromotive force that could continue to drive electrically charged particles had to await the development of the chemical battery by the Italian physicist Alessandro Volta in 1800. The classical theory of a simple electric circuit assumes that the two terminals of a battery are maintained positiv ...
Quanta to Quarks part 2 - Connecting-Sharing-and
... On average, 2.4 neutrons are produced by every fission of U-235. A fission chain reaction is one where the neutrons produced in one fission go on to produce another fission and so on. In order for a fission chain reaction to occur, the sample of fissionable material must have a certain minimum size ...
... On average, 2.4 neutrons are produced by every fission of U-235. A fission chain reaction is one where the neutrons produced in one fission go on to produce another fission and so on. In order for a fission chain reaction to occur, the sample of fissionable material must have a certain minimum size ...
Gamma Decay - UNLV Radiochemistry
... If Z of x-ray-emitting species known, it can be determined whether it decays by EC or IT ...
... If Z of x-ray-emitting species known, it can be determined whether it decays by EC or IT ...
Radioactivity and Nuclear Physics
... The atomic mass number in a nuclear decay process is conserved. This means that you will have the same total atomic mass number on both sides of the equation. Charge is also conserved in a nuclear process. It is impossible to predict when an individual atom will decay, one can only predict the proba ...
... The atomic mass number in a nuclear decay process is conserved. This means that you will have the same total atomic mass number on both sides of the equation. Charge is also conserved in a nuclear process. It is impossible to predict when an individual atom will decay, one can only predict the proba ...
E o - NICADD
... cycle, when they are most sensitive to ionizing radiation (as that of protons and photons) ...
... cycle, when they are most sensitive to ionizing radiation (as that of protons and photons) ...
Black-body Radiation the Charge Field
... the electron that is actually quantized in current theory. What I mean is, in the current wavefunction, the electron energy or momentum is given steps. These steps are assigned to a change in momentum, and they can take only quantized values. The electron then absorbs or releases a photon to go from ...
... the electron that is actually quantized in current theory. What I mean is, in the current wavefunction, the electron energy or momentum is given steps. These steps are assigned to a change in momentum, and they can take only quantized values. The electron then absorbs or releases a photon to go from ...
Self Force on Accelerated Charged Particle
... and Biot-Savart Laws, Griffiths and Heald [4] discuss the limitations of these laws, and their possible modification. Even though the eq. (1) form of the BiotSavart law for a very small accelerated charge e is only approximately correct, Jackson [5] points out that an exact result may be obtain ...
... and Biot-Savart Laws, Griffiths and Heald [4] discuss the limitations of these laws, and their possible modification. Even though the eq. (1) form of the BiotSavart law for a very small accelerated charge e is only approximately correct, Jackson [5] points out that an exact result may be obtain ...
PLANCK`S CONSTANT AND THE PHOTO
... out frequencies higher than the green or yellow light being measured. This will help prevent ambient light and ultraviolet light from higher orders that may overlap the lower diffraction orders from interfering with the measurements. The variable transmission filter may be attached in the same way a ...
... out frequencies higher than the green or yellow light being measured. This will help prevent ambient light and ultraviolet light from higher orders that may overlap the lower diffraction orders from interfering with the measurements. The variable transmission filter may be attached in the same way a ...
Radiation
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: electro-magnetic radiation (also known as ""continuum radiation"") γ such as radio waves, visible light, and x-rays particle radiation such as α, β, and neutron radiation (discrete energy per particle) acoustic radiation such as ultrasound, sound, and seismic waves. (dependent on intervening mass for transmission)Radiation is often categorized as either ionizing or non-ionizing depending on the energy of the radiated particles. Ionizing radiation carries more than 10 eV, which is enough to ionize atoms and molecules, and break chemical bonds. This is an important distinction due to the large difference in harmfulness to living organisms. A common source of ionizing radiation is radioactive materials that emit α, β, or γ radiation, consisting of helium nuclei, electrons or positrons, and photons, respectively. Other sources include X-rays from medical radiography examinations and muons, mesons, positrons, neutrons and other particles that constitute the secondary cosmic rays that are produced after primary cosmic rays interact with Earth's atmosphere.Gamma rays, X-rays and the higher energy range of ultraviolet light constitute the ionizing part of the electromagnetic spectrum. The lower-energy, longer-wavelength part of the spectrum including visible light, infrared light, microwaves, and radio waves is non-ionizing; its main effect when interacting with tissue is heating. This type of radiation only damages cells if the intensity is high enough to cause excessive heating. Ultraviolet radiation has some features of both ionizing and non-ionizing radiation. While the part of the ultraviolet spectrum that penetrates the Earth's atmosphere is non-ionizing, this radiation does far more damage to many molecules in biological systems than can be accounted for by heating effects, sunburn being a well-known example. These properties derive from ultraviolet's power to alter chemical bonds, even without having quite enough energy to ionize atoms.The word radiation arises from the phenomenon of waves radiating (i.e., traveling outward in all directions) from a source. This aspect leads to a system of measurements and physical units that are applicable to all types of radiation. Because such radiation expands as it passes through space, and as its energy is conserved (in vacuum), the intensity of all types of radiation from a point source follows an inverse-square law in relation to the distance from its source. This law does not apply close to an extended source of radiation or for focused beams.