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Light Years Context Object • Faster Olympic Sprinter • Horse at Full Gallop • Race Car • Fighter Jet • Space Shuttle • New Horizons Probe (Fastest Man-Made Object) Momentum • 28 mph • • • 50 mph 240 mph 1, 000 mph 17, 000 mph 52, 000 mph

Waves… • • • Most waves are either longitudinal or transverse. Sound waves are longitudinal. But all electromagnetic waves are transverse…

Electromagnetic Waves ▪▪▪▪▪▪

Electromagnetic Waves

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

Light Years Lamborghini @ 100 mph Light Years Across United States 30 hrs 75 Times in 1 sec To the Moon 14 Weeks Moon and Back 2 secs Last Planet (Neptune) 3100 Years Sun to Earth 8 min old when reaches

Light Years- Unit of measurement Context • 186, 000 mps • 670, 000 mph • 6, 000, 000/h Math

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

Microwaves- second longest wavelength • • Wavelengths from 1 mm- 1 m Uses: ■ ■ ■ Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS

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

• The Doppler effect can be used to determine how fast stars or galaxies are approaching or moving away from Earth. ➢When a star or galaxy is approaching Earth, the lines in its spectrum are shifted toward the shorter (bluer) wavelengths. ➢When the star or galaxy is moving away, the lines in its spectrum shift toward the longer (redder) wavelengths. • The larger the shift, the greater is the speed.

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

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

Spectroscope • A tool forming and examining spectra especially in the visible region of the electromagnetic spectrum

Line vs. Continuous Spectrum Line • Consisting of discrete lines, usually characteristic of excited atoms or molecule Continuous • A broad range of light frequencies without any interruptions

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/PRI SM%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_12548 f 4 bd 1. jpg? v=1217429879 http: //intamod. com. au/images/uv 2. JPG http: //science. hq. nasa. gov/kids/imagers/ems/xrays. html 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 http: //www. epinion. eu/wordpress/wpcontent/uploads/2008/05/airport-security 1. jpg http: //science. hq. nasa. gov/kids/imagers/ems/gamma. ht ml 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