I know the questions are very silly but because different websites refer to different things, I am becoming confused with something that should be simple to understand. Could someone please tell me why these conditions were necessary? For example, ' The cathode rays consist of material particles because they produced shadow of objects placed in the way'ģ.Two of the conditions of the experiment were air at very low pressure and secondly a very high potential difference. The path cathode rays travel is not affected by the position of the anode.' I just can't seem to understand this explanation of the one of the observations.Also, different websites analyses this observation differently. That is why, cathode rays cast shadow of any solid object placed in their path. Is this the color of the radiation itself?Ģ.' Cathode rays travel in straight lines. However, as shown in the above diagram there was no fluorescent material in the experiment carried out first on the cathode ray tube. Many websites I read through refer to a fluorescent material. The technology for these displays is much different than that for CRTs.1.One of the observations I learned was that the glass tube begins to glow with a brilliant green light. Notebook computers typically use liquid crystal display. The most common specification for CRT displays is known as SVGA (Super Video Graphics Array). In computer systems, there are several display modes, or sets of specifications according to which the CRT operates. The CRT thus produces three overlapping images: one in red (R), one in green (G), and one in blue (B). These devices have three electron guns, one for the primary color red, one for the primary color green, and one for the primary color blue. However, virtually all CRTs today render color images.

This is typical of a monochrome, or single-color, CRT. The illustration shows only one electron gun. But the scanning takes place at such a rapid rate that your eye sees a constant image over the entire screen. As viewed from the front of the CRT, the spot moves in a pattern similar to the way your eyes move when you read a single-column page of text. This causes the spot to race across the screen from right to left, and from top to bottom, in a sequence of horizontal lines called the raster. To produce an image on the screen, complex signals are applied to the deflecting coils, and also to the apparatus that controls the intensity of the electron beam. The electron beam produces a tiny, bright visible spot when it strikes the phosphor-coated screen. There are two sets of deflecting coils: horizontal and vertical.(In the illustration, only one set of coils is shown for simplicity.) The intensity of the beam can be varied. Deflecting coils produce an extremely low frequency electromagnetic field that allows for constant adjustment of the direction of the electron beam. The electron gun generates an arrow beam of electrons. The CRT in a computer display is similar to the 'picture tube' in a television receiver.Ī cathode-ray tube consists of several basic components, as illustrated below. Most desktop computer displays make use of CRTs. A cathode-ray tube (CRT) is a specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface.

Cathode ray experiment video