What is the Electromagnetic Spectrum? September 21, 2006Posted by healthyself in Blogroll, Cell phone safety, Color, Definitions, Electromagnetic Field, Electromagnetic waves, Frequencies, Gamma Rays, Infrared, Light, light beam, Low Frequencies, Magnetic, MHz, Microwave exposure, Oscillate, Photons, Radio Waves, Spectrum, Visible Light.
“..Electromagnetic radiation can be described in terms of a stream of photons, each traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy. … the only difference between radio waves, visible light, and gamma-rays is the energy of the photons. Radio waves have photons with low energies, microwaves have a little more energy than radio waves, infrared has still more, then visible, ultraviolet, X-rays, and gamma-rays.””Actually, the amount of energy a photon has makes it sometimes behave more like a wave and sometimes more like a particle. This is called the “ wave-particle duality” of light. …only in how it behaves. Low energy photons (such as radio) behave more like waves, while higher energy photons (such as X-rays) behave more like particles. …the electromagnetic spectrum can be expressed in terms of energy, wavelength, or frequency. Each way of thinking about the EM spectrum is related to the others in a precise mathematical way. The relationships are:
the wavelength equals the speed of light divided by the frequency
lambda = c / nu” http://imagine.gsfc.nasa.gov/docs/science/know_l2/emspectrum.html