chemistry : light
... do not know why. This is one of the main principles of Einstein's Theory of Relativity. Light is emitted in to forms, particles and waves. The particles are called photons. Light comes in both forms. This is called the dual nature of light. Photons can be observed by atoms, while waves radiant energy. The frequency of visible light is very small it comes in 7 main wavelengths. Red ,orange, yellow, green, blue, indigo, violet. To the extremes of these are ultra- violet and inferred with we cannot see. Light Has many uses. We need it to live. Plants use it to make food and keep themselves alive. We and other animals use it to see. We use it for energy in solar cells for electricity or to heat water. It is an inexpensive source of energy witch we can use to to replace gasoline. Light is a small part of the energy spectrum. It is the middle range and beside it is ultra-violet and infa-red. The extremes of this range are gamma radiation and microwaves. Both of these are lethal to us, even though they have very useful for cooking and energy. If you where to put light to pass threw a prism it would divide into 7 colors. This is called a spectrum. These seven colors make up all the colors we can see. Color is just a partic...