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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.
What else can I help you with?
How was the Cathode Ray Tube Amusement device invented?
Cathode ray tube amusement device was created in 1947.
What are the Adavantages and disadvantages of vacuum tube?
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.
What is the negatively charged electrode of a cathode ray tube?
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.
Why deflection is necessary in cathode ray tube?
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.
What makes cathode-ray tubes dangerous?
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.
Why is the cathode-ray tube in figure 4 connected to a vacuum pump?
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.
How was the Cathode Ray Tube Amusement device invented?
Cathode ray tube amusement device was created in 1947.
What following piece of equipment was used by jj Thomson to find electrons?
J.J. Thomson used a cathode ray tube to discover electrons. By passing an electric current through the tube, he observed the deflection of a beam of electrons, which led to his conclusion about the existence of electrons.
What is a vacuum tube used as a display screen in a computer or video display terminal called?
cathode-ray tube
What are the images created in CRT monitors?
Cathode ray tube
What is the full meaning of CRT in computer?
A "CRT" is a cathode ray tube. An old style computer monitor (not computer).
What is the flow of a cathode ray inside a cathode ray tube?
Electrons.
Why television are also known as cathode ray tube?
because cathode ray tube is the heart of the television.
Who first invented the cathode ray tube?
The cathode ray tube was invented in 1897 by Ferdinand Braun.
Who made the beam of electrons in vacuum tube?
J.J. Thomson is credited with creating the first beam of electrons in a vacuum tube in the late 19th century. This discovery led to the development of the cathode ray tube, which was integral to the development of television and other electronic displays.
He conducted the cathode-ray tube experiment?
J.J Thomson conducted the cathode-ray tube experiment in 1911.
When did Cathode ray tube amusement device happen?
Cathode ray tube amusement device happened in 1947.
