Light Electromagnetic radiation Electromagnetic spectrum Spectra.
Electromagnetic Radiation
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Transcript of Electromagnetic Radiation
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Electromagnetic Radiation
Conceptual Physics
M. Lancaster 2014(borrowed)
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Waves… a reviewMost waves are either longitudinal or transverse.
Sound waves are longitudinal.
But all electromagnetic waves are transverse…
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Electromagnetic wavesProduced by the movement of electrically charged particles
Can travel in a “vacuum” (they do NOT need a medium
Travel at the speed of light (300,000 km/s or 186,000 miles/s)
Also known as EM waves
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Wave-particle DualityEM waves can behave like a wave or like a particle
A “particle” is called a photon
So……..they can behave either way
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Radio wavesLongest wavelength EM wavesUses:
TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication
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MicrowavesWavelengths from 1 mm- 1 mUses:
Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS
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Infrared RadiationWavelengths in between microwaves and visible light
Uses: Night vision goggles Remote controls Heat-seeking missiles
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Visible lightOnly type of EM wave able to be detected by the human eye
Red light is the lowest frequency light. Violet is the highest frequency.
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UltravioletShorter wavelengths than visible light
Uses: Black lights Sterilizing medical equipment Water disinfection Security images on money
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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
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X-raysTiny wavelength, high energy waves
Uses: Medical imaging Airport security Inspecting industrial welds
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Gamma RaysSmallest wavelengths, highest energy EM waves
Uses Food irradiation Cancer treatment Treating wood flooring
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Image credits1. http://www.antonine-education.co.uk/New_items/MUS/imag
es/Making6.gif2. http://www.geocities.com/researchtriangle/campus/6791/
einstein12.jpg3. http://abyss.uoregon.edu/~js/glossary/wave_particle.ht
ml4. http://www.astro.princeton.edu/~gk/A402/electromagneti
c_spectrum.jpg5. http://science.hq.nasa.gov/kids/imagers/ems/radio.html6. http://www.nentjes.info/Palace/radio-6.gif7. http://www.mobilewhack.com/motorola-h12-bluetooth-head
set.jpg8. http://www.stuffintheair.com/radar-real-time-weather.h
tml9. http://www.imaging1.com/gallery/images/AV%20Night%20vi
sion%20goggles.jpg10. http://www.global-b2b-network.com/direct/dbimage/50329
753/Study_Remote_Control.jpg11. http://www.georgiaprismaward.com/The_Prism_Story_files
/PRISM%20brand%20imagemed.jpg12. http://science.hq.nasa.gov/kids/imagers/ems/uv.html
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Image Credits13. http://farm3.static.flickr.com/2385/2381723771_1
2548f4bd1.jpg?v=121742987914. http://intamod.com.au/images/uv2.JPG15. http://science.hq.nasa.gov/kids/imagers/ems/xray
s.html16. http://www.sciencelearn.org.nz/var/sciencelearn/
storage/images/contexts/see_through_body/sci_media/neck_x_ray/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.html
19. http://www.aboutnuclear.org/print.cgi?fC=Food20. http://www.roswellpark.org/files/1_2_1/brain_spi
nal/gamma%20knife%204c.jpg