Electromagnetic Spectrum
- 1. Electromagnetic Radiation Conceptual Physics J. Beauchemin 2009
- 2. Waves… a review Most waves are either longitudinal or transverse. Sound waves are longitudinal. But all electromagnetic waves are transverse…
- 3. ? ?
- 4. 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
- 5. Wave-particle Duality Light can behave like a wave or like a particle A “particle” of light is called a photon
- 7. Radio waves Longest wavelength EM waves Uses: TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication
- 8. Microwaves Wavelengths from 1 mm- 1 m Uses: Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS
- 9. Infrared Radiation Wavelengths in between microwaves and visible light Uses: Night vision goggles Remote controls Heat-seeking missiles
- 10. 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
- 11. Ultraviolet Shorter wavelengths than visible light Uses: Black lights Sterilizing medical equipment Water disinfection Security images on money
- 12. 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
- 13. X-rays Tiny wavelength, high energy waves Uses: Medical imaging Airport security Inspecting industrial welds
- 14. Gamma Rays Smallest wavelengths, highest energy EM waves Uses Food irradiation Cancer treatment Treating wood flooring
- 15. Image credits 1. http://www.antonine-education.co.uk/New_items/MUS/images/Makin 2. http://www.geocities.com/researchtriangle/campus/6791/einstein12. 3. http://abyss.uoregon.edu/~js/glossary/wave_particle.html 4. http://www.astro.princeton.edu/~gk/A402/electromagnetic_spectrum 5. http://science.hq.nasa.gov/kids/imagers/ems/radio.html 6. http://www.nentjes.info/Palace/radio-6.gif 7. http://www.mobilewhack.com/motorola-h12-bluetooth-headset.jpg 8. http://www.stuffintheair.com/radar-real-time-weather.html 9. http://www.imaging1.com/gallery/images/AV%20Night%20vision%2 10. http://www.global-b2b-network.com/direct/dbimage/50329753/Study 11. http://www.georgiaprismaward.com/The_Prism_Story_files/PRISM%2 12. http://science.hq.nasa.gov/kids/imagers/ems/uv.html
- 16. Image Credits 13. http://farm3.static.flickr.com/2385/2381723771_12548f4bd1. 14. http://intamod.com.au/images/uv2.JPG 15. http://science.hq.nasa.gov/kids/imagers/ems/xrays.html 16. http://www.sciencelearn.org.nz/var/sciencelearn/storage /images/contexts/see_through_body/sci_media/neck_x_r ay/17945-5-eng-NZ/neck_x_ray_full_size_portrait.jpg 17. http://www.epinion.eu/wordpress/wp- content/uploads/2008/05/airport-security1.jpg 18. http://science.hq.nasa.gov/kids/imagers/ems/gamma.ht ml 19. http://www.aboutnuclear.org/print.cgi?fC=Food 20. http://www.roswellpark.org/files/1_2_1/brain_spinal/ga mma%20knife%204c.jpg
Editor's Notes
- #2: http://www.jessb.org
- #4: Prompt students to guess what the teal box, then the blue box, is hiding. (Wavelength, Amplitude)
- #7: Clicking the little rainbow box at the top of each slide will bring you back to this one
- #8: Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram
- #9: Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram
- #10: Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram
- #11: Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram
- #12: There is one more UV slide…
- #13: Table will fill in from left to right, top to bottom as you advance through. Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram
- #14: Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram
- #15: Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram