Electromagnetic+Spectrum+and+Light

Electromagnetic Spectrum and Light ** __ Electromagnetic spectrum and light: __ ** A spectrum is light that passes through a prism and projects all the colours of the rainbow. These colours are red, orange, yellow, green, blue, indigo and violet. Light is electromagnetic radiation that is visible from the naked eye. Light travels at an approximate speed of 299,792,458 m/s (metres per second) in a vacuum. **Wavelength, energy and frequency trends:**

**__ Radio waves: __** The first part of the spectrum are the radio waves, they can very from 1mm to more than seven miles in length. Microwaves, radios, ovens and radars work by using different radio waves. __ T**elevision waves:** __ The second part of the spectrum is television. Television sound and pictures are carried on short-wavelength radio waves. The frequencies of the waves are modulated, to make them carry a signal. **__ Radar: __** The third part of the spectrum is radar. Radar these send out small waves that detect echo’s in their path.Radar is short for radio, detection and ranging. __ **Microwaves:** __ The fourth part of the spectrum is the microwaves. These are supposedly been released when the big bang occurred and why the universe has been made. They are low-level microwave radiation permeates space. In a microwave oven, microwaves rapidly change their alignment of water  molecules,and this heats up the food.
 * __ The parts of the spectrum: __**

__ **Infrared waves:** __ The fifth part of the spectrum is infrared waves. Things that are hot produce these waves. Thermo cameras use infrared to see heat in the air in in our  bodies.

**__ Visible Light: __** The sixth part of the spectrum is visible light this can be seen by reflections and white light that passes through a prism.

__ **Ultraviolet:** __ The seventh part of the spectrum is ultraviolent waves, these waves are produced by very hot objects, like the sun and other stars. Ultraviolent waves carry more energy than light waves, which is why they can penetrate and burn skin. The eighth part of the spectrum is x-rays. These rays (waves) carry more energy than visible light. They are able to penetrate the parts of our bodies, but they cannot pass through bon. They can also be detected by photographic film. The ninth part of the spectrum is gamma waves; these waves are a form of radioactivity released by some atomic nuclei, have very short wavelengths. They carry a large amount of energy and can penetrate metals and concrete. __ **E-M Trends** __ The trend that occurs when the spectrum is acceding is that radio waves are at the top of the spectrum and have the biggest wavelength but when you descend down the spectrum you see that wavelengths decrease.
 * __ X-rays: __**
 * __ Gamma Waves: __**