PART 1The electromagnetic spectrum is the frequency range of possible electromagnetic radiation. The spectrum varies from 0 Hertz up to 2.4x1023 Hertz. The exact wavelength limits of the spectrum are unknown, however it is widely believed that the short wavelength limit is equal to the Planck length (1,616x10-35 m) and the long wavelength limit is the length of the Universe. Electromagnetic radiation (EMR) is a phenomenon that takes the form of self-propagating waves produced by the movement of electrically charged particles, which can move through matter or a vacuum. Physicists have observed that in addition to acting like waves, EMR acts like a stream of massless particles (called "photons"). The frequencies of electromagnetic radiation can be calculated by dividing the speed of light by the wavelength of electromagnetic radiation. the electromagnetic spectrum was named by scientists to provide an easier way to remember and refer to ranges; however, in reality neighboring types of electromagnetic energy often overlap. The higher the frequency, the more harmful the rays. At the lower end of the spectrum are "Radio" waves. This range of radiation is low energy, low frequency and has a long wavelength. Radio waves are used by antennas, they are used to transmit and receive data through modulation. This band contains frequencies between 300 Hz and 300 GHz, which are wavelengths longer than about one millimeter. This spectrum is generally regulated by the government, and licenses are sold to operators to use it to reduce interference. This range of the spectrum is commonly used for television, amplitude modulation radio (AM radio), frequency modulation radio (FM radio), mobile telecommunications...... middle of paper..... .enm - nanometer (one billionth of a meter)PHz - Petahertzpm - Picomemeter (One trillionth of a meter)SKA - Square Kilometer ArrayTHz - TerahertzUV - UltravioletW - WattYHz - YottahertzZHz - ZettahertzWorks citedDiagram and image attributions:All images used in this document are in the public domain or released under a Creative Commons license.Figure 1 - Author unknown (electromagnetic spectrum) [CC-BY]Figure 2 - Wikipedia contributors (spectral colors of visible light) [CC-BY-SA 3.0]Figure 3 - Hajor (Very Large Array in New Mexico) [CC-BY-SA 3.0])Figure 4 - NASA (center of the M83 galaxy) [Public Domain]Figure 5 - NASA (absorption of gamma rays in the atmosphere) [Public Domain]Figure 6 - NASA (Messier 87 radio image) [Public domain]Figure 7 - CSIRO (Parkes Radio Telescope) [CC-BY-SA 3.0]Figure 8 - XILO Studios (SKA) [CC-BY 2.5]