Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Chapter 13 Electromagnetic Waves Section 1 Characteristics of Light

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 Characteristics of Light Chapter 13 Electromagnetic Waves An electromagnetic wave is a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Radio waves Longest wavelength EM waves Uses: –TV broadcasting –AM and FM broadcast radio –Avalanche beacons –Heart rate monitors –Cell phone communication

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Microwaves Wavelengths from 1 mm- 1 m Uses: –Microwave ovens –Bluetooth headsets –Broadband Wireless Internet –Radar –GPS

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Infrared Radiation Wavelengths in between microwaves and visible light Uses: –Night vision goggles –Remote controls –Heat-seeking missiles

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Visible light Only type of EM wave able to be detected by the human eye Violet is the highest frequency light Red light is the lowest frequency light

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Ultraviolet Shorter wavelengths than visible light Uses: –Black lights –Sterilizing medical equipment –Water disinfection –Security images on money

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu X-rays Tiny wavelength, high energy waves Uses: –Medical imaging –Airport security –Inspecting industrial welds

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gamma Rays Smallest wavelengths, highest energy EM waves Uses –Food irradiation –Cancer treatment –Treating wood flooring

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 Characteristics of Light Chapter 13 Electromagnetic Waves, continued Electromagnetic waves vary depending on frequency and wavelength. All electromagnetic waves move at the same speed of light in a vacuum. The speed of light, c, equals c = 3.00  10 8 m/s Wave Speed Equation c = f speed of light = frequency  wavelength

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Practice A Open books to page 449 –#1, 3, 5 Chapter 13 Section 1 Characteristics of Light