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Why tungsten in cathode ray tube coated with thorium oxide or barium oxide?
Tungsten is used in the cathode ray tube (CRT) because it has a high melting point and good thermionic emission properties, which means it can easily release electrons. The thorium oxide or barium oxide coating on the tungsten helps to improve electron emission efficiency by reducing work function and enhancing electron current. This combination allows for better electron beam production in the CRT.
What does FESEM mean in electron microscopy?
Field Emission Scanning Electron Microscopy
Why are no two emission spectra for different elements ever the same?
Because emission spectrum are the result of the electron configuration of the element and no two elements have exactly the same electron configuration.
In a beta particle emission what does the neutron split into?
a proton and an electron
A beta particle is formed in the nucleus of an isotope due to the?
Radioactive decay; beta decay is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted
What are 4 methods of electron emission?
1- Secondary Emission 2- Thermionic Emission 3- Field Emission 4- Photo-Electric Emission Badbanky
When does Thermionic emission occur during x-ray production?
thermionic emission occurs when the filaments are heated to a certain degree, causing the electrons to boil off and form a space charge or electron cloud.
What are the differences between thermionic emission and evaporation?
Thermionic emission occurs when electron leaves the surface of metals while evaporation occur in liquid when strong electron gain energy and escape the liquid surface in gaseous form
What is the uses of thermionic emission?
electricity generation
What is the derivation of Richardson's Equation of Thermionic Emission?
Rechardsons equation
What is the name of the process by which electrons are released from a hot cathode?
thermionic emission
The principle of heating a filament to obtain a movement of electrons is called?
Thermionic emission
The principle underlying the creation of a space charge in the x-ray tube is?
Thermionic Emission
What is the principle underlying the creation of a space charge in the x-ray tube?
Thermionic Emission
Where does the thermionic emission occur in cathode rays tube?
Basically the thermionic rays are fast moving electrons. They originate in the region having an excess of electrons. So originate from the cathode.
Why tungsten in cathode ray tube coated with thorium oxide or barium oxide?
Tungsten is used in the cathode ray tube (CRT) because it has a high melting point and good thermionic emission properties, which means it can easily release electrons. The thorium oxide or barium oxide coating on the tungsten helps to improve electron emission efficiency by reducing work function and enhancing electron current. This combination allows for better electron beam production in the CRT.
What is a CRO account?
It works on the following principles : (i)thermionic emission (ii)deflection of the electron beam by the electric and magnetic field (iii)fluorescence produced by the electron beam on a fluorescent screen
