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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.

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15y ago
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13y ago

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.

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13y ago

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.

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13y ago

To create an electron cloud that can be shaped into a beam.

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11y ago

vaccum is created in the cathode ray tube because the metal inside the cathode tube can react with air

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Q: Why vacuum is created in cathode ray tube?
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