electromagnetic spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic...
TRANSCRIPT
![Page 1: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/1.jpg)
Electromagnetic Spectrum
Unit 3 Lesson 3
![Page 2: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/2.jpg)
Unit 3 Lesson 3 The Electromagnetic Spectrum
Florida Benchmark
Copyright © Houghton Mifflin Harcourt Publishing Company
• SC.7.P.10.1 Illustrate that the sun’s energy arrives as radiation with a wide range of wavelengths, including infrared, visible, and ultraviolet, and that white light is made up of a spectrum of many different colors.
![Page 3: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/3.jpg)
Waves… a review
Most waves are either longitudinal or transverse.
Sound waves are longitudinal. But all electromagnetic waves
are transverse…
![Page 4: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/4.jpg)
?
?
![Page 5: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/5.jpg)
Electromagnetic Light Show
Copyright © Houghton Mifflin Harcourt Publishing Company
What is the nature of light?
• Light waves are different from other kinds of waves.
• When an electrically charged particle vibrates, its fields also vibrate, producing an electromagnetic (EM) wave.
• Light waves are vibrating electric and magnetic fields that transfer energy through space.
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 6: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/6.jpg)
Electromagnetic waves Produced by the movement of
electrically charged particles Can travel in a “vacuum” (they do
NOT need a medium Travel at the speed of light
Also known as EM waves
![Page 7: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/7.jpg)
Wave-particle Duality Light can behave like a wave or like
a particle A “particle” of light is called a photon
![Page 8: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/8.jpg)
![Page 9: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/9.jpg)
What is the nature of light?
• EM waves travel as perpendicular electric and magnetic fields.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 10: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/10.jpg)
What is the nature of light?
• Radiation is energy that has been transmitted by waves or particles. This transfer of energy is called EM radiation.
• All EM waves move at the same speed in a vacuum: the speed of light.
• EM waves can travel through many materials.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 11: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/11.jpg)
What determines the color of light?
• Different wavelengths of light are perceived by our eyes as different colors.
• White light is what we perceive when we see all the wavelengths of light at once, in equal proportions.
• Our eyes only register three colors of light: red, green, and blue. All other colors we see are a mixture of these three colors.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 12: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/12.jpg)
Invisible Colors
Copyright © Houghton Mifflin Harcourt Publishing Company
What are the parts of the EM spectrum?
• The range of frequencies that EM waves can have are called the electromagnetic (EM) spectrum.
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 13: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/13.jpg)
Radio waves Longest wavelength EM waves Uses:
TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication
![Page 14: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/14.jpg)
Microwaves Wavelengths from 1 mm- 1 m Uses:
Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS
![Page 15: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/15.jpg)
Infrared Radiation Wavelengths in between microwaves
and visible light Uses:
Night vision goggles Remote controls Heat-seeking missiles
![Page 16: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/16.jpg)
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
![Page 17: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/17.jpg)
Ultraviolet Shorter wavelengths than visible
light Uses:
Black lights Sterilizing medical equipment Water disinfection Security images on money
![Page 18: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/18.jpg)
Ultraviolet (cont.) UVA UVB and UVC
Energy Highest of UV waves
Lower than UVA
Health risks
Extremely low risk for DNA damage Can destroy Vitamin A in skin
Can cause DNA damage, leading to skin cancer Responsible for sunburn
![Page 19: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/19.jpg)
X-rays Tiny wavelength, high energy waves
Uses: Medical imaging Airport security Inspecting industrial welds
![Page 20: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/20.jpg)
Gamma Rays Smallest wavelengths, highest
energy EM waves Uses
Food irradiation Cancer treatment Treating wood flooring
![Page 21: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/21.jpg)
Star Light, Star Bright
Copyright © Houghton Mifflin Harcourt Publishing Company
How much of the sun’s energy reaches us? • Most of the sun’s energy is in the narrow visible
light range, but the sun gives off some radiation in every part of the spectrum.
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 22: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/22.jpg)
How much of the sun’s energy reaches us? • Not all wavelengths of light penetrate the
atmosphere equally. Radio waves penetrate the atmosphere easily.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 23: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/23.jpg)
How much of the sun’s energy reaches us? • Some EM radiation can be dangerous to humans,
so we take extra steps to protect ourselves.
• UV light can be harmful. It can penetrate clouds.
• In space, the dangers from EM radiation are very high because there is no atmosphere to filter the radiation.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 24: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/24.jpg)
Frequency Asked Questions
Copyright © Houghton Mifflin Harcourt Publishing Company
How much energy does EM radiation have? • Different frequencies of EM waves carry different
amounts of energy.
• High-frequency EM waves have more energy than low-frequency EM waves.
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 25: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/25.jpg)
How much energy does EM radiation have? • Because low-frequency waves, such as radio
waves, carry less energy, they are safer. Walkie-talkies and baby monitors use radio waves.
• High-frequency waves, such as UV light, carry more energy and can be harmful. UV light causes sunburns, and X-rays require precautions.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 3 Lesson 3 The Electromagnetic Spectrum
![Page 26: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/26.jpg)
Unit 3 Lesson 3 The Electromagnetic Spectrum
Fire in the Sky
Copyright © Houghton Mifflin Harcourt Publishing Company
• The stream of electrically charged particles from the sun is called the solar wind.
• When solar wind encounters Earth’s magnetic field, the particles are accelerated.
• When the accelerated particles collide with the atmosphere, they give off EM radiation in the form of light.
![Page 27: Electromagnetic Spectrum - clarkparkway.com · fields also vibrate, producing an electromagnetic (EM) wave. • Light waves are vibrating electric and magnetic fields that transfer](https://reader035.vdocuments.mx/reader035/viewer/2022062605/5fd2a924d7b3af791f155bac/html5/thumbnails/27.jpg)
Unit 3 Lesson 3 The Electromagnetic Spectrum
Fire in the Sky
Copyright © Houghton Mifflin Harcourt Publishing Company
• Near the poles, the accelerated particles form an aurora that can light up the sky.
• The aurora at the North Pole is called the aurora borealis. At the South Pole, it is called the aurora australis.
• The color of the aurora depends on the type of atoms in the atmosphere that react with the solar wind.