The Electromagnetic Spectrum

Forms of Radiation

Electromagnetic Waves

Electromagnetic (EM) waves are disturbances in electrical or magnetic fields. Unlike mechanical waves, EM waves do not require a medium to travel through, even traveling through the vacuum of space. EM waves also travel faster, as mechanical waves are based on amplitude and EM waves are based on rapid vibration.

The Electromagnetic Spectrum

Electromagnetic waves have a wide range of existence. EM waves vary from low frequency, long wavelength radio waves to high frequency, short wavelength gamma rays and cosmic rays.
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Gamma Rays and Cosmic Waves

Gamma rays and Cosmic rays are the most powerful EM waves. With the highest frequency, smallest size, and shortest wavelength, gamma rays are used in medical practice in the form of PET scans, which can display images of inside of the body. They also can be found most everywhere in space, as stars, supernovas, and the Universe create them.
What is the Electromagnetic Spectrum?