Electromagnetic Radiation Conceptual Physics M Lancaster 2013 borrowed

Electromagnetic Radiation Conceptual Physics M. Lancaster 2013 (borrowed)

Waves… a review p Most waves are either longitudinal or transverse. p Sound waves are longitudinal. p But all electromagnetic waves are transverse…

Electromagnetic waves p Produced by the movement of electrically charged particles p Can travel in a “vacuum” (they do NOT need a medium p Travel at the speed of light (300, 000 km/s or 186, 000 miles/s) p Also known as EM waves

Wave-particle Duality p EM waves can behave like a wave or like a particle p A “particle” is called a photon p So……. . they can behave either way

Radio waves p Longest wavelength EM waves p Uses: n TV broadcasting n AM and FM broadcast radio n Avalanche beacons n Heart rate monitors n Cell phone communication

Microwaves p Wavelengths from 1 mm- 1 m p Uses: n Microwave ovens n Bluetooth headsets n Broadband Wireless Internet n Radar n GPS

Infrared Radiation p Wavelengths in between microwaves and visible light p Uses: n n n Night vision goggles Remote controls Heat-seeking missiles

Visible light p Only type of EM wave able to be detected by the human eye p Red light is the lowest frequency light. Violet is the highest frequency.

Ultraviolet p Shorter light p Uses: n n wavelengths than visible Black lights Sterilizing medical equipment Water disinfection Security images on money

Ultraviolet (cont. ) UVA UVB and UVC Energy Highest of UV waves Lower than UVA Health risks p Extremely low risk for DNA damage p Can destroy Vitamin A in skin p Can cause DNA damage, leading to skin cancer p Responsible for sunburn

X-rays p Tiny wavelength, high energy waves p Uses: n n n Medical imaging Airport security Inspecting industrial welds

Gamma Rays p Smallest wavelengths, highest energy EM waves p Uses n n n Food irradiation Cancer treatment Treating wood flooring

Image credits 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. http: //www. antonineeducation. co. uk/New_items/MUS/images/Making 6. gif http: //www. geocities. com/researchtriangle/campus/6791/einste in 12. jpg http: //abyss. uoregon. edu/~js/glossary/wave_particle. html http: //www. astro. princeton. edu/~gk/A 402/electromagnetic_spe ctrum. jpg http: //science. hq. nasa. gov/kids/imagers/ems/radio. html http: //www. nentjes. info/Palace/radio-6. gif http: //www. mobilewhack. com/motorola-h 12 -bluetoothheadset. jpg http: //www. stuffintheair. com/radar-real-time-weather. html http: //www. imaging 1. com/gallery/images/AV%20 Night%20 visi on%20 goggles. jpg http: //www. global-b 2 bnetwork. com/direct/dbimage/50329753/Study_Remote_Control. jpg http: //www. georgiaprismaward. com/The_Prism_Story_files/ PRISM%20 brand%20 imagemed. jpg http: //science. hq. nasa. gov/kids/imagers/ems/uv. html

Image Credits 13. 14. 15. 16. 17. 18. 19. 20. http: //farm 3. static. flickr. com/2385/2381723771_1254 8 f 4 bd 1. jpg? v=1217429879 http: //intamod. com. au/images/uv 2. JPG http: //science. hq. nasa. gov/kids/imagers/ems/xrays. ht ml http: //www. sciencelearn. org. nz/var/sciencelearn/storag e/images/contexts/see_through_body/sci_media/neck_x _ray/17945 -5 -eng-NZ/neck_x_ray_full_size_portrait. jpg http: //www. epinion. eu/wordpress/wpcontent/uploads/2008/05/airport-security 1. jpg http: //science. hq. nasa. gov/kids/imagers/ems/gamma. html http: //www. aboutnuclear. org/print. cgi? f. C=Food http: //www. roswellpark. org/files/1_2_1/brain_spinal/ga mma%20 knife%204 c. jpg