B+TV

= __Isotope and Radioactivity__ = = = =Name of radioactive isotope/electromagnetic radiation/scientist:= Electromagnetic radiation transmitted from televisions.

= = = = = = = = = = = = = = = = =Explanation of interesting facts: (how used/works.experiments/discoveries)=
 * 1) In Most Television, the inside of the screen is coated with phosphors, which when exposed to radiation emit visible light. In Black and white televisions, the phosphors only glow white when stuck, but in color TVs there are 3 phosphor arranged in teh screen to give off red, blue and green light. The phosphors are arranged to give off a variety of colors.
 * 2) A TV works by receiving **composite video signals**. The electronics in the TV detect these 'pulses' and trigger the beams, which strike the phosphors in the screen, therefore displaying an image.
 * 3) A **shadow mask** is used to let the beams of electromagnetic radiation through and direct them towards the correct phosphor.
 * 4) To make red visible on your screen, a red beam is shot at a red phosphor, same with blue and green. To make white, all three beams are shot at the same time, and to make black, none are shone.
 * 5) 1/5 of high school school students watch TV for over 3 hours a day.

=3 Advantages of using the radioactive isotope/radiation/benefits of discovery=

1. TV is used as entertainment, and most people watch it daily. Most people watch it for fun.

2. TV is also used to inform people through the News, Documentrys etc.

3. TV is used for advertising. Companies can help sales of their products.

=3 Disadvantages of using the radioactive isotope/radiation/discovery:= 1. Too much of watching the TV, can affect your eyesight. Just like focusing on small text in a book for a long period of time with out letting your eyes rest, can make them tired and weaken.

2. Wasted time. Watching TV with out gaining any knowledge, is a waste of time. Instead you can be doing something useful.

3. Watching TV excessively, can result in obesity, since you are not active while sitting on a couch and watching...

=Is the radioactive isotope/radiation/discovery still used today? Explain= Yes, almost every household has one or more televisions. There is no serious threat from watching TV and it can be quite informative. TV holds an unlimited amount of information and helps people daily to keep informed, with not only knowledge, but world events etc. (News).

=References= www.howstuffworks.com www.limitv.org www.red-branch.com

=Diagram/image (include source and caption)=