ELECTROMAGNETIC SPECTRUM

• The Electromagnetic Spectrum is the continous range of electromagnetic waves arranged in order of frequency or wavelength
• Electromagnetic Forms in order(Longest to shortest):

  A.) Radio Waves

  B.) Microwaves

  C.) Infrared Waves

  D.) Visible Light

  E.) Ultraviolet Waves

  F.) X-Rays

  G.) Gamma Rays
• Radio Waves - Longest of all electromagnetic waves
• Radio Waves - This wave are used for a lot of things, Wi-Fi, GPS, RFID, Automatic Doors, MRIs, and more.
• Radio waves are typically generated by an alternating current
• GPS - Global Positioning System
• RFID - Radio Frequency Identification
• MRI - Magnetic Resonance Imaging
• Radio Waves were discovered by Heinrich Hertz
• The Microwave region in the EM Spectrum lies somewhere between 300Mhz to 300Ghz
• James Clerk Maxwell discovered microwaves in 1864
• Microwaves are mainly used for communication, especially those with frequencies from 2 to 40Ghz.
• Microwaves are used for long-distance communication, to send signals for cable television, as well as video or aidio feeds from broadcast stations.
• Microwave Doppler radars - These Invention using the microwave are used in weather forecasting
• Microwaves are used to cook
• Microwaves are also used in industrial processes for drying and curing products, also the heat of microwaves are used to shrink or destroy tumors.
• Microwave Tomography - Imaging technology used to asses and monitor the progress of treatment of breast cancer
• Infrared literally means "below red"
• Infrared radiation has a lower frequency that the red part of visible light
• Sir william herschel, a british astronomer discovered infrared radiation in 1800
• Infrared radiation cannot be seen by the naked eye but can be felt through heat
• Objects with higher temperature produces infrared
• Infrared rays are used in television remote controls, burglar alarm systems, night vision cameras, and certain types of thermometer.
• Physiotherapusts use heat lamps emitting infrared radiation to heal sports injuries
• Visible Light - The only waves seen with the naked eye.
• Isaac Newton discovered the range of the wavelength in the visible light spectrum
• Isaac Newton refracted white light using a prism in order to know the range of its wavelength
• The sequence of visible light from longest to shortest wavelength

  A.) Red

  B.) Orange

  C.) Yellow

  D.) Green

  E.) Blue

  F.) Indigo

  G.) Violet
• Visible light helps you see objects
• Visible light is used in traffic lights, commerical displays, car headlights, and taillights.
• Every device that has a visible screen, such as televisions and touchpad devices uses visible light.
• Visible light is also used by plants for their food using a method called photosynthesis
• VLC - Visible Light Communication
• Visible Light Communication using LEDs, is an emerging form of wireless communication technology.
• LED - Light Emittind Diode
• LASER - Light Amplification by Stimulated Emission of Radiation
• The region next to visible light is called ultraviolet radiation
• Ultraviolet Radiation is more popularly known as UV
• Ultraviolet Radiation was discovered by German physicist Johann Wilhelm Ritter
• Three kids of UV Rays:

  • UVA
  • UVB
  • UVC