0
Why the speed of electron beam is greater than the light speed in cathode ray oscilloscope?
Wiki User
∙ 15y ago
Why is the speed of the electron beam greater than the speed of light in cathode ray oscilloscope.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
What emits light when the current flows from the anode to the cathode?
lioght
How does the colour tv work?
Color TV works by putting sending more or less power through lights of different colors. In the old cathode ray tube (CRT) TVs, this was done with a phosphorus screen and a proton particle beam. In newer LCD and plasma TVs, each pixel is a light and is turned on or off in varying degrees of intensity.
What is the use of a control grid in cathode ray tube?
The grid in a cathode ray tube is used to control the beam current. The grid in the CRT is positioned near the cathode, and between it (the cathode) and any other elements, like those for focusing. The cathode is the (cylindrical) element that is coated with a metal that has good thermionic properties. That means that as it gets hot, electrons from within its structure reach such high thermal energies that they can actually leave and hang around outside of the metal itself. (Recall that the tube is very highly evacuated.) There is a heater inside the cathode to heat it up to set up the thermionic emission and the space charge. The grid is actually close to the cathode so it can affect this space charge. If the grid is driven negative, the negative grid will "push" on the space charge (the cloud of negative electrons) and keep it in place. (The tube is said to be cut off.) As the grid is driven positive, it will start attracting electrons. Yes, some will actually go to the grid, but the majority will, when flying away from the cathode (and becoming cathode rays) be "caught" by the high voltage on the anode. The stream of electrons, called a beam (because it's focused) will be pulled past the grid to go do their thing at the anode itself. The anode is actually the phosphor coating on the inside of the tube at the "front" where the viewer looks. Electrons smack the coating on the inside of the glass of the tube at a point where they are aimed and ionize it causing it to emit photons. The photons (light) will travel through the glass and out of the tube to the viewer's eyes. Recall that the grid is close to the cathode, and it tells the space charge what to do. If the grid is negative, the space charge huddles near the cathode and the tube is cut off. If the grid becomes a bit positive, some electrons zip out from the cathode, past the grid and on out to the anode. The more positive the grid, the more electrons are called out from the cathode to make the trip to the anode. Moving electrons are current. And the grid is controlling the amount of beam current.
What is recombination in electronics?
Process by which a conduction band electron gives up energy (in the form of heat or light) and falls into a valence band hole.
What are the characteristics of video display devices?
General CharacteristicsIn the CRT (cathode-ray tube) of a computer or video monitor an electron beam moves back and forth across the back of the screen. Each time the beam makes a pass across the screen, it lights up phosphor dots (pixels) on the inside of the glass tube, thereby illuminating the active portions of the screen. By drawing many such lines from the top to the bottom of the screen, it creates an entire image. A color CRT uses three electron guns which activate red light-emitting, green light-emitting, and blue light-emitting phosphors.Abhishek JaiswalMCA IEM Kolkata
Why is the speed of electron beam greater than the light speed in cathode ray oscilloscope?
It isn't. Nothing travels faster than light, especially an electron. If it tried it would become infinitely heavy as it reached the speed of light. You would then need an infinite force to accelerate it further. To know more, Google on "special relativity"
What is state of matter forms when a fluorescent light bulb is turned on?
when a fluorescent light bulb is turned on, the state in it is still gaseous state. no change of state occurs by turning it on. It functions like a CRO(search cathode ray oscilloscope). one end acts as a cathode and the other as an anode. electron beam is produced by the cathode and it moves toward the anode. on thier way to anode, electrons collide with the walls of the glass. on the inside of the glass, it is coated with such a material that when electron collides with that surface, it produces a small flash of light. when millions of electrons do that, we see a bulb turned on.
What is the difference in electron movement when you observe a red color of light and a blue color of light?
The energy jump of an electron producing blue light is greater than the energy jump of an electron producing red light.
Why are cathode rays similar to light?
they aren't. cathode rays are charged electrons, light is uncharged photons.
Was the cathode ray slower than the speed of light?
No, the cathode ray is faster than the speed of light.
Do light microscopes allow us to observe specimens in greater detail than electron microscopes?
No
Why is the beam of light called a cathode ray?
Cathode rays are beams of electrons.
How electron microscopes are different from light microscopes?
Electron microscope gives a greater magnification. Instead of lenses, the electron microscope uses magnets to aim a beam of electrons at thin slices of cells. A light microscope does not have as good as a magnification and resolution as a electron mircroscope does. A microscope as a curved lens, so the light bounces off of it and makes the small object larger.
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.
How do cathode ray tubes work?
The cathode ray tube (CRT) is an evacuated glass envelope containing an electron gun (a source of electrons) and a fluorescent screen, usually with internal or external means to accelerate and deflect the electrons. When electrons strike the fluorescent screen, light is emitted. Source: Copied from Wikipedia
What is the history of oscilloscope?
Oscilloscope is a device by means of which waveforms can be studied by geting them displayed on a fluorescent screen (cathode-ray tuble) using and electron beam. The electron beam gets deflected by magnetic fields.
What is the purpose of an electron?
The purpose of an electron microscope is to be able to study structures and cells in greater detail than with a light microscope or the naked eye
