The light given off by the phosphor during exposure to the electron beam is known as
Fluorescence
In a cathode-ray tube the electron beam strikes a phosphor coating, and the phosphor emits light in two parts (Hearn & Baker).
The light emitted while the phosphor is being struck by the electron beam is called fluorescence.
Phosphorescence is the glow that continues after the beam has been removed, as excited electrons return slowly to their ground state.
Persistence is the time taken for the emitted light to decay to one-tenth of its original intensity; it is a property of the phosphor, not the light itself.
Retracing is the return movement of the beam to the start of the next scan line or frame, during which the beam is blanked.
Fluorescence option is correct.
Similar Questions
Match the following :
List – I List – II a. Tablet, Joystick i. Continuous devices b. Light Pen, Touch Screen ii. Direct devices c. Locator, Keyboard iii. Logical devices d. Data Globe, Sonic Pen iv. 3D interaction devices Codes :
a b c d
Which of the following is/are the components of a CRT ?
(a) Electron Gun
(b) Control Electrode
(c) Focusing Electrode
(d) Phosphor Coated Screen
Codes :
Which of the following is/are the principal components of a memory-tube display ?
(a) Flooding gun (b) Collector
(c) Phosphorus grains (d) Ground
Codes :
Match the following :
List - I List - II (a) Flood Gun (i) An electron gun designed to flood the entire screen with electrons. (b) Collector (ii) Partly energised by flooding gun, stores the charge generated by the writing gun. (c) Ground (iii) Used to discharge the collector. (d) Phosphorus grains (iv) Used in memory - tube display and similar to those used in standard CRT. (e) Writing Gun System (v) Used in memory - tube display and basically the same as the electron gun used in a conventional CRT. Codes :
Beam-penetration and shadow-mask are the two basic techniques for producing color displays with a CRT. Which of the following is not true ?
I. The beam-penetration is used with random scan monitors.
II. Shadow-mask is used in raster-scan systems.
III. Beam-penetration method is better than shadow-mask method.
IV. Shadow-mask method is better than beam-penetration method.
Match List I with List II
List I List II A. 2-D Array Input I. Liquid Crystal display B. Transmissive device II. Flat-bed scanner C. Binary image III. Camera D. 1-D array input IV. Ink jet printer Choose the correct answer from the options given below:
Match the following :
a. Glass i. Contains liquid crystal and serves as a bonding surface for a conductive coating. b. Conductive coating ii. Acts as a conductor so that a voltage can be applied across the liquid crystal. c. Liquid crystal iii. A substance which will polarize light when a voltage is applied to it. d. Polarized film iv. A transparent sheet that polarizes light. Codes :
Which of the following statement(s) is/are correct ?
Important Questions from Graphics Systems
- Which of the following are applicable to programming graphics (pre-design phase) during design development process?
(a) Graphic worksheets
(b) Analysis cards
(c) Variety of matrics
(d) Bubble diagram
Choose the correct option : The duration of phosphorescence exhibited by a phosphor is known as ______.
A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately:
Match the following :
List – I List – II a. Tablet, Joystick i. Continuous devices b. Light Pen, Touch Screen ii. Direct devices c. Locator, Keyboard iii. Logical devices d. Data Globe, Sonic Pen iv. 3D interaction devices Codes :
a b c d
Which component of CRT regulate the intensity of electron beam?
