What is Electromagnetic Spectrum ?
ELECTROMAGNETIC SPECTRUM : As the sun sends its rays to Earth, it lights up our world. But there's more to the world than the things we can see with light alone. As light races through space, it makes electricity and magnetism ripple down its path like waves on the sea. Light is not the only energy that behaves like this: there's a whole collection of similar waves called the Electromagnetic Spectrum. Some of these waves are very long, with large spaces from one peak to the next. Others are extremely short and close to each other. Different waves have different uses, depending on their length. Although we can't see most electromagnetic waves, they are incredibly useful, helping us with everything from spotting broken bones to watching TV shows. WHERE ELECTROMAGNETIC RADIATION COMES FROM: Light is made when atoms flash on and off like fireflies. If you hear an iron bar, it goes red hot. The atoms inside absorb heat energy, bu...