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PPT : Observations About Television
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Fluorescence
* Electrons collide with phosphors inside screen
* Phosphors are electronically excited
* Phosphors emit their excess energy as light
* Different phosphors emit different colors
Aiming the Electrons
* Electrons are “boiled” off a hot wire
* They’re accelerated toward positive charge
* They’re focused and steered en route to screen
o Focusing is electric and magnetic
o Steering is magnetic
Image Creation
* Electron beam intensity variations are synchronized with the beam scanning
* Patterns of dark and light create images
* TV station provides the intensity information
Color Television
* Three colors all that’s required for color TV
o Red, Green, and Blue are primary colors of light
o Combining these can make us see any color
* Color television has three phosphors: RGB
* 3 electron beams illuminate those 3 phosphors
* Shadow mask aids in hitting correct phosphor
Question:
A television image is created by beams of moving electrons that collide with the inside front surface of the television picture tube and cause it to glow. Will a magnet held still near the picture tube affect the image that forms?
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