Galvanic Cell
... In a spontaneous redox reaction, electrons are transferred from the substance oxidized to the substance reduced If reactants are arranged in a certain way, these electrons can be made to move through a wire The reactants must be separated and yet in contact with each other so that the reaction will ...
... In a spontaneous redox reaction, electrons are transferred from the substance oxidized to the substance reduced If reactants are arranged in a certain way, these electrons can be made to move through a wire The reactants must be separated and yet in contact with each other so that the reaction will ...
Electron Impact Excitation of Helium
... identify the energies that are absorbed most efficiently by the helium. To those ends, we have a helium tube circuit wired as shown in the diagram. • The ~4V filament supply provides current for heating the filament to temperatures required for thermionic emission of electrons. There is a diode (bui ...
... identify the energies that are absorbed most efficiently by the helium. To those ends, we have a helium tube circuit wired as shown in the diagram. • The ~4V filament supply provides current for heating the filament to temperatures required for thermionic emission of electrons. There is a diode (bui ...
Ferroelectrics in microwave technology
... APPLICATIONS OF FERROELECTRICS IN MICROWAVE TECHNOLOGY This Special Issue will focus on potential applications of ferroelectric materials, in both paraelectric and ferroelectric phases, in microwave devices and systems. A strong preference will be given to experimental papers with RF/microwave devic ...
... APPLICATIONS OF FERROELECTRICS IN MICROWAVE TECHNOLOGY This Special Issue will focus on potential applications of ferroelectric materials, in both paraelectric and ferroelectric phases, in microwave devices and systems. A strong preference will be given to experimental papers with RF/microwave devic ...
ATOMIC EXCITATION POTENTIALS
... atom in the ground state may absorb a photon of energy exactly equal to the energy difference between the ground state and some excited state, whereas another atom may collide with an electron and absorb some fraction of the electron's kinetic energy which is the amount needed to put that atom in so ...
... atom in the ground state may absorb a photon of energy exactly equal to the energy difference between the ground state and some excited state, whereas another atom may collide with an electron and absorb some fraction of the electron's kinetic energy which is the amount needed to put that atom in so ...
Presentazione di PowerPoint
... of incident light levels as well as the photon counting region. it offers a wide dynamic range. However, if the incident light amount is too large, the output begins to deviate from the ideal linearity. This is primarily caused by anode linearity characteristics, but it may also be affected by catho ...
... of incident light levels as well as the photon counting region. it offers a wide dynamic range. However, if the incident light amount is too large, the output begins to deviate from the ideal linearity. This is primarily caused by anode linearity characteristics, but it may also be affected by catho ...
Charge-to-Mass Ratio of the Electron
... emission from a hot filament contained in a small cylindrical enclosure at the base of the glass chamber. A voltage applied to a grid inside the cylinder allows the electrons to be accelerated to a desired final velocity. The electron beam then emanates from a thin slit in the cylindrical enclosure. ...
... emission from a hot filament contained in a small cylindrical enclosure at the base of the glass chamber. A voltage applied to a grid inside the cylinder allows the electrons to be accelerated to a desired final velocity. The electron beam then emanates from a thin slit in the cylindrical enclosure. ...
Introduction - Union College
... that setting for the entirety of the experiment—NOTE: the voltage to the heater of the electron gun should NEVER exceed 6.3 V – higher voltages will burn out the filament and destroy the e/m tube. It will take a few minutes for the filament to heat up sufficiently. 2. While the filament is heating, ...
... that setting for the entirety of the experiment—NOTE: the voltage to the heater of the electron gun should NEVER exceed 6.3 V – higher voltages will burn out the filament and destroy the e/m tube. It will take a few minutes for the filament to heat up sufficiently. 2. While the filament is heating, ...
Electricity - Effingham County Schools
... heats up and expands when the current is too large. • They can be reset by switching back to “on” position. ...
... heats up and expands when the current is too large. • They can be reset by switching back to “on” position. ...
experiment outlines - Brown University Wiki
... apparatus. The beam can be deflected magnetically in the field of surrounding Helmholtz Coils, and electrically by means of plates within the tube. With this apparatus, the ratio of the electron's charge to its mass can be determined by more than one method, or conversely using e/m as known, the ele ...
... apparatus. The beam can be deflected magnetically in the field of surrounding Helmholtz Coils, and electrically by means of plates within the tube. With this apparatus, the ratio of the electron's charge to its mass can be determined by more than one method, or conversely using e/m as known, the ele ...
Description of an Oscilloscope Cathode Ray Tube
... width of the beam moving to the screen. It is located next to the base of the CRT and consists of five major parts: heater, cathode, control grid, focusing anode, and accelerating anode (Figure 3). The heater, a rod of metal, is supplied an electric current and converts it to heat. As the heater inc ...
... width of the beam moving to the screen. It is located next to the base of the CRT and consists of five major parts: heater, cathode, control grid, focusing anode, and accelerating anode (Figure 3). The heater, a rod of metal, is supplied an electric current and converts it to heat. As the heater inc ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.