in a cathode ray tube, the number of electrons that reach the florescent screen is controlled by the A. anode b. cathode. c. deflecting plate d. grid
I believe the answer is c but I think most modern CRTs use deflection by magnetic coils. Some electrostatic devices are also used and this may be where the word "plate" comes from.
In a cathode ray tube, the number of electrons that reach the florescent screen is controlled by the d. grid.
In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the grid.
To understand why the grid controls the number of electrons reaching the screen, let's briefly explain the basic functioning of a cathode ray tube (CRT). A CRT is a vacuum tube that produces images through the use of an electron beam. It consists of three main components: the cathode, the anode, and the grid.
The cathode is a heated filament that emits electrons through a process called thermionic emission. These emitted electrons are then accelerated towards the anode, which is a positively charged electrode. The anode attracts the electrons and controls their speed.
Now, let's focus on the grid. The grid is an electrode positioned between the cathode and the anode. Its primary function is to control the flow of electrons. By applying a varying voltage to the grid, the electron beam can be manipulated, allowing for the formation of images on the screen.
So, in a cathode ray tube, the grid is responsible for controlling the number of electrons that pass through it. By adjusting the voltage on the grid, the flow of electrons can be regulated, thereby controlling the intensity of the electron beam and ultimately determining the number of electrons that reach the fluorescent screen.