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Electromagnetic Radiation Conceptual Physics J. Beauchemin 2009

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Page 1: Electromagnetic Spectrum Mac

Electromagnetic Radiation

Conceptual Physics

J. Beauchemin 2009

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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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?

?

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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

Also known as EM waves

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Wave-particle DualityLight can behave like a wave or like a particle

A “particle” of light is called a photon

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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

Violet is the highest frequency light

Red light is the lowest frequency light

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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