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Electromagnetic Spectrum

Discover the wonders of the Electromagnetic Spectrum (EMS) and its diverse radiation types, from radio waves to gamma rays. Learn about the energy levels, wavelengths, and practical uses of each wavelength band.

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Electromagnetic Spectrum

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  1. Electromagnetic Spectrum “EMS”

  2. Electromagnetic Spectrum • Types of radiation that travel in waves • 7 types of EM radiation (from lowest to highest frequencies) • Radio • Microwaves • Infrared • Visible Light • Ultraviolet • X-rays • Gamma

  3. Electromagnetic Spectrum Highest Energy Lowest energy

  4. EMS • High-frequency electromagnetic waves have a short wavelength and high energy • Low-frequency waves have a long wavelength and low energy

  5. Radio Waves • RF refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by an alternating current fed to an antenna • Emitted by radio stations, televisions, stars, submarines, avalanche beacons, heart monitors, & wireless LAN

  6. Microwaves • Microwaves have wavelengths approximately in the range of 30 cm to 1 mm • Easily absorbed by water • Used in radar, Bluetooth, and YES…your microwave oven!

  7. Infrared • The name literally means “below red” • Used by military for night vision, target acquisition, & tracking • Also used for short range wireless communication, & weather forecasting • Associated with heat

  8. Visible Light • Visible Light (part of the spectrum you can see) • Wavelengths range from 400 nm to 700 nm (4.00 x 10-7 m to 7.00 x 10-7 m) • Longest wavelength = red • Shortest wavelength = violet • 1 nm = 1 x 10-9 m

  9. Ultraviolet Waves • The name means “beyond violet” • Used for tanning, treating psoriasis, & production of Vitamin D (UVB) • Some animals (bees) can see UV rays • Divided into three groups • UVA – blacklight • UVB – medium wave • UVC – germicidal

  10. X-rays • A wavelength in the range of 10 to 0.01 nanometers • Used for imaging bones, radiotherapy, & astronomy

  11. Gamma Rays • Produced from sub-atomic particle interaction • Most are generated from nuclear reactions • Wavelength ranges from 10-11 m to 10-14 m • Used for finding cracks in metals, sterilization of medical equipment, CAT scans, & created The Incredible Hulk 

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