25th March 2005, 8:38 PM
Wait is this a joke? Is this like, you are basically trying to get a rise out of me?
http://electronics.howstuffworks.com/tv.htm
The electrons don't get past that layer, well unless you turn off the TV and rub the screen with your hand. What they do is excite the phosphors coating the screen and the phosphors glow. You see that glow, not the electrons.
http://science.howstuffworks.com/eye.htm
That link explains exactly what your eyes are designed to detect. I THINK it also covers things that can make your rods and cones "go off" without visible light. However, as I explained, electrons can't just be fired through the air and be expected to take a straight path any real distance. They can only do that in a vacuum.
http://electronics.howstuffworks.com/tv.htm
The electrons don't get past that layer, well unless you turn off the TV and rub the screen with your hand. What they do is excite the phosphors coating the screen and the phosphors glow. You see that glow, not the electrons.
Quote:The terms anode and cathode are used in electronics as synonyms for positive and negative terminals. For example, you could refer to the positive terminal of a battery as the anode and the negative terminal as the cathode.
In a cathode ray tube, the "cathode" is a heated filament (not unlike the filament in a normal light bulb). The heated filament is in a vacuum created inside a glass "tube." The "ray" is a stream of electrons that naturally pour off a heated cathode into the vacuum.
Electrons are negative. The anode is positive, so it attracts the electrons pouring off the cathode. In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. This tight, high-speed beam of electrons flies through the vacuum in the tube and hits the flat screen at the other end of the tube. This screen is coated with phosphor, which glows when struck by the beam.
Quote:A phosphor is any material that, when exposed to radiation, emits visible light. The radiation might be ultraviolet light or a beam of electrons. Any fluorescent color is really a phosphor -- fluorescent colors absorb invisible ultraviolet light and emit visible light at a characteristic color.It is important to note that when they refer to "the radiation" they are talking about what energizes the phosphos to release light, not what radiation they emit.
In a CRT, phosphor coats the inside of the screen. When the electron beam strikes the phosphor, it makes the screen glow. In a black-and-white screen, there is one phosphor that glows white when struck. In a color screen, there are three phosphors arranged as dots or stripes that emit red, green and blue light. There are also three electron beams to illuminate the three different colors together.
There are thousands of different phosphors that have been formulated. They are characterized by their emission color and the length of time emission lasts after they are excited.
http://science.howstuffworks.com/eye.htm
That link explains exactly what your eyes are designed to detect. I THINK it also covers things that can make your rods and cones "go off" without visible light. However, as I explained, electrons can't just be fired through the air and be expected to take a straight path any real distance. They can only do that in a vacuum.
"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." ~ Charles Babbage (1791-1871)