Ch. 22 Sec. 2 The Electromagnetic Spectrum Unit 4 Waves Ch. 22 Sec. 2 The Electromagnetic Spectrum

Electromagnetic Waves are EVERYWHERE!

The Electromagnetic Spectrum electromagnetic spectrum - the range of all EM. waves w/ different frequencies & wavelengths   all EM. waves are produced by moving charged particles faster particle movement = higher frequency = more energy increasing frequency/energy = decreasing wavelength

The Electromagnetic Spectrum

EMS:  Radio Waves radio waves - EM. waves w/ the longest wavelength, lowest frequency, & least energy Longer than 30cm 104Hz ex. TV signals, AM/FM radio signals, cell phone signals used in most forms of telecommunications technology

EMS:  Microwaves microwaves - type of radio waves used in some cell phones & in microwaves 1mm – 30cm 108Hz

EMS:  Infrared Waves infrared waves - EM. waves given off by almost every object 700nanometers – 1mm 1012Hz ex. heat from a warm fire, warmth from a body used to map wildfires, locate prey (pit vipers), change TV channels, etc.

EMS:  Visible Light visible light - EM. waves that result when an object is heated making electrons move faster 400nm – 700nm Varies depending on color only EM. waves that can be seen most objects do not give off visible light, but rather reflect it = color different wavelengths = colors

EMS:  Ultraviolet Radiation ultraviolet radiation - EM. waves w/ enough energy to damage cells 60nm – 400nm 1016Hz makes up a portion of sunlight unlike visible light & radio waves, most UV radiation is absorbed by the atmosphere (ozone layer) used to sterilize surgical equipment, aid in vitamin D production, etc.

EMS:  X Rays X rays - EM. waves w/ enough energy to penetrate skin & muscles 0.001nm – 60nm 1018Hz used to view bones like ultraviolet radiation, can be harmful to cells

EMS:  Gamma Rays gamma rays - EM. waves w/ the shortest wavelength, highest frequency & most energy Shorter than 0.001 nm 104Hz produced by changes in atomic nuclei can be deadly to cells used to destroy cancer cells & bacteria on meat, etc.

EMS: THE GOOD AND THE BAD

EM Spectrum Foldable 8 Tabs On Each Tab Include: Frequency/Wavelength Electromagnetic Waves Radio Waves Microwaves Infrared Waves Visible Light Ultraviolet Waves X-rays Gamma Rays On Each Tab Include: Frequency/Wavelength 2 Examples 1 Interesting/Fun Fact