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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 is a common cathode?
a cathode that is common
What following piece of equipment was used by jj Thomson to find electrons?
JJ Thomson discovered electrons using a cathode ray tube.
What causes an emission line 777NM?
light from flourescent light bulbs causes emission lines and the gas inside the bulb is cold leading straps of colors to come into appearance through a telescope. -chakshu
IS carbon rod a cathode or anode?
cathode
What is the name of the process by which electrons are released from a hot cathode?
thermionic emission
Why electrons of cathode does not end up after some time because of its continuous emission of electrons?
Because the cathode is connected to an external source of power, from which electrons are continuously supplied to the cathode.
What type of electrode is a cold cathode?
Cold cathode is a cathode, an electrode that emits electrons, which is not electrically heated by an element. Cold cathodes are used in gas discharge lamps such as neon lamps and discharge tubes.
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.
How do cathode rays form?
Cathode rays are the emission of free electrons form the negative pole of an electric circuit. To get this to happen you need to warm the cathode and place it in a vacuum tube with a high voltage across it. The electron then jump form the cathode and fly across the empty tube to the anode (positive end). They may be bent by magnetic fields in flight.
How did you know pure water contain ions?
Emission of hydrogen and oxygen from the anode and cathode respectively, in the hydrolysis of pure water proves that there are ions.
Why cathode rays are negatively charged?
Cathode rays are produced when the metal cathode has a high voltage applied to it - this has the effect of "boiling" the electrons off the cathode's surface producing cathode rays, and so cathode rays can be seen as a stream of electrons i.e. negatively charged particles.AnswerElectrons are released from the surface of a cathode through thermionic emission. This is achieved by a heaterlocated at the cathode, and not due to a high voltage. The function of the high voltage (between the cathode and an anode placed closer to the screen) is to attract these electrons towards the screen of the CRT. So a 'cathode ray' is simply a beam of electrons which, of course, are negatively charged.
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.
Do all vacuum tubes light up?
No, there are some cold cathode vacuum tubes. These do not light.
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
Why is galvanometer used when you know that electric current travels from cathode to anode of the battery?
I think that you talk about the usage of galvanometer in photoelectric emission experiment. Right? The main purpose of using a galvanometer is to know about whether current flows or not and also the direction in which current flows. Moreover current flows right from anode to cathode and electrons do flow from cathode to anode within the discharge tube.
Can the outputs of cold cathode inverters kill you?
Yes and No, some people may be affected by it some people won't this all varies on your body's natural resistance against electricity. If you exercise caution when using cold cathode inverters(or anything that involves high voltage or high current) you will be fine.
