0
What is the stream of particles originating from a cathode in a vacuum tube?
Wiki User
∙ 14y ago
Not sure of the question, but *electrons flow from cathode to plate in a CRT. A deflection coil guides the electron beam to various areas of the screen. Some CRTs use electrostatic deflection, where the beam is deflected by four grids that steer the beam.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoThese ar actually electrons. To have fun with such a stream, take a magnet, and hold it near the tube.
Add your answer:
Earn +20 pts
Why vacuum is created in cathode ray tube?
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 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 difference between electron beam and cathod rays?
X ray is light and belongs to the family of electromagnetic waves. It is said to be photon whose rest mass is zero. X ray does not have charge.Electron is considered as particle which has mass, of 9.1 x10 -31 kg.Electrons posses negative charge that equals 1.602 x 10 -19 C
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.
What were the two main problems of using vacuum tubes in computers?
Valves, or vacuum tubes, were large, generated tremendous heat, and were prone to failure.Vacuum tubes worked much like transistors, but required a filament to heat the cathode so that electrons could flow through the plate when there were the proper grid voltages for that. If the cathode heater burned out, the cathode would not work, and the tube would need to be replaced. Comparing to a PNP or NPN transistor, the cathode would be equivalent to the emitter, the plate would compare to the base, and the grid would computer to the collector. Comparing to an FET, the cathode would be the source, the grid would compare the the gate, and the plate would compare to the drain.
Where did the electrons from cathode ray come from?
In a cathode ray tube (CRT), the particles, which are electrons, originate at the heated cathode, becoming the so-called cathode rays. The electrons stream off the cathode and rush over to the anode.
Why cathode ray are not electro-magnetic waves?
A cathode ray is a stream of electrons, not a stream of photons like the electromagnetic wave. It's a different type of particle. The electrons don't move at light speed in a vacuum; also, they are electrically charged.
What would happen to cathode rays in a vacuum?
Cathode rays in a vacuum would travel until stopped (or deflected by an electromagnetic field).
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.
What is a vacuum tube in which a stream of electronics is focused on a phosphorescent screen in order to produce a image?
A stream of electrons is accelerated by several thousand volts, & focused on to a phosphorescent screen in a CRT (cathode ray tube) commonly known as a picture tube.
Do all vacuum tubes light up?
No, there are some cold cathode vacuum tubes. These do not light.
How do scientists detect cathode rays?
Cathode rays are found in vacuum tubes. Scientists are able to view them when they are a negative cathode because they emit a light and can glow.
Who made the beam of electrons in vacuum tube?
This beam of electrons is emited by the cathode under voltage difference.
What minerals are in a vacuum?
There are no minerals in a vacuum. A vacuum is empty. There are no air particles or any other particles for that matter.
Streams of electrons directed by a vacuum tube?
I think the answer is 'Cathode Rays'
Why do the particles move faster in a vacuum?
Particles do not move faster in a vacuum. Particles move faster when the temperature increases.
How emission of electrons in vacuum tubes?
A heated metal in a vacuum with an electrical charge can emit electrons. The filament is the part of the tube that gets hot. Some tubes use electrons emitted from the filament. Others use the filament to heat a metal cathode, causing it to emit electrons. The electrons flow to a positively charged "plate" electrode through the vacuum.
