What is the electromagnetic spectrum? The electromagnetic spectrum is a range of wavelength frequencies over which electromagnetic radiation extends. There are five different types of electromagnetic waves: Radio waves, microwaves, gamma rays, ultraviolet, and X- rays. All the different kinds of waves travel at the speed of light in a vacuum. Other different waves travel much slower like a sound wave, which requires a matter to move.
Radio Waves
Radio waves very in sizes. They can be as long as long as the size of the Earth, to just being a few meters long. So like light it can travel a great distance. Radio waves can transmit music, conversations, data & pictures through the air for millions of miles. Radio waves have completely changed society even though they cannot be seen by humans. Radio waves very in speeds from as fast as 300 GHz (Gigahertz) to as slow as 30 GHz. Naturally occurring radio waves are made by lightening, or by astronomical objects. Then you have the artificially generated radio waves for fixed or mobile radio communications such as radio broadcasting and radar. The antenna that used to be installed on TV sets is even set to receive a signal. Large doses of radio waves are believed to cause cancer, leukemia and other disorders. Some people claim that the very low frequency field from overhead power cables near their homes has affected their health.

Microwaves
Microwaves are radio waves that are as long as meter or as short as a millimeter or equivalent. A microwave can have a frequency ranging from 300 GHz to 0.03 GHz. Microwaves are also used by fixed traffic speed cameras, and for radar, which is used by aircraft, ships and weather forecasters. There are also dangers to microwave extreme exposure. Prolonged exposure to microwaves is known to cause "cataracts" in your eyes, which is a clouding of the lens, preventing you from seeing clearly (if at all!) So don't make a habit of pressing your face against the microwave oven door to see if your food's ready! Recent research indicates that microwaves from mobile phones can affect parts of your brain - after all, you're holding the transmitter right by your head. Other research is inconclusive, although there is a feeling that you're more vulnerable if you're young and your brain is still growing.
So the advice is to keep calls short.

Gamma Rays
Is a pattern of neural oscillation in humans with a frequency between 25 to 100 Hz, though 40 Hz is typical. Gamma-rays have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. These waves are generated by radioactive atoms and in nuclear explosions. Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells. Gamma-rays travel to us across vast distances of the universe, only to be absorbed by the Earth's atmosphere. Different wavelengths of light penetrate the Earth's atmosphere to different depths. Instruments aboard high-altitude balloons and satellites like the Compton Observatory provide our only view of the gamma-ray sky. Gamma-rays are the most energetic form of light and are produced by the hottest regions of the universe. They are also produced by such violent events as supernova explosions or the destruction of atoms, and by less dramatic events, such as the decay of radioactive material in space.

Ultraviolet Waves
Ultraviolet (UV) light has shorter wavelengths than visible light. Though these waves are invisible to the human eye, some insects, like bumblebees, can see them! Scientists have divided the ultraviolet part of the spectrum into three regions: the near ultraviolet, the far ultraviolet, and the extreme ultraviolet. The three regions are distinguished by how energetic the ultraviolet radiation is, and by the "wavelength" of the ultraviolet light, which is related to energy. The near ultraviolet, abbreviated NUV is the light closest to optical or visible light. The extreme