Its not connected to a vacuum pump necesarily but it does have a vacuum inside of it. The reason is the cathode send out a beam of electrons in order to activate the phosphorescent layer on the CRT (lets say the tv screen). The stream of electrons is relatively weak in term of what it is able to penetrate at the same time it has to be acurately deflected by the magnets so that it can accuretly hit a pixel on the tv screen. So if the CRT had air in it the air molecules would get in the way of the electron beams and cause them to be partially absorbed and mis-directed. Also if it had air in it it would expand and crack the actual tube because it would overheat due to the high energy of the electrons.
Vacuum is required in vacuum tubes, because they are used to manipulate a flow of electrons between the cathode and the plate (anode). Air would get in the way, and it would also contribute to early burnout of the filament.
If the electrons struck anything on their way to the screen they would combine with it or at least be thrown off of their track. It only works in a vacuum.
To create an electron cloud that can be shaped into a beam.
vaccum is created in the cathode ray tube because the metal inside the cathode tube can react with air
Cathode ray tube amusement device was created in 1947.
when the vacuum sucks up things it goes through the tube and into the bag ...Unless you are talking about electronics, then a vacuum tube is used to form an amplifying circuit. Some tubes can emit cathode rays onto a screen (Cathode Ray Tube = CRT) to display a picture and some can function as diodes to regulate current flow.
The negatively charged electrode of a cathode ray tube (CRT) is the cathode. The tube is a cathode ray tube, and electrons stream off the cathode, are accelerated across the evacuated space and "directed" either electromagnetically or electrostatically, and then strike the phosphor coating on the positively charged anode at a "location" determined by the "directing" elements.
It is not necessary in a cathode ray tube, it is a side effect and is needed in the calculations to ensure that there are no errors.
Cathode Ray Tubes are potentially dangerous because they are vacuum sealed and can implode. This can cause the shattered glass to fly outward and also exposes the toxic coating inside of the tube.
A Cathode-ray tube is a vacuum that is used to get the air out. Cathode rays (electrons) cannot penetrate through any significant amount of air.
JJ Thomson discovered electrons using a cathode ray tube.
Cathode ray tube amusement device was created in 1947.
cathode-ray tube
Cathode ray tube
A "CRT" is a cathode ray tube. An old style computer monitor (not computer).
Electrons.
The cathode ray tube was invented in 1897 by Ferdinand Braun.
because cathode ray tube is the heart of the television.
Cathode ray tube amusement device happened in 1947.
J.J Thomson conducted the cathode-ray tube experiment in 1911.
None of these appliances use a cathode ray tube. Older type TVs used a cathode ray tube, its common name was the picture tube.