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Video• http://www.youtube.com/watch?featu
re=player_embedded&v=xZ6XUk7QLbU
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Light Years ContextObject• Faster Olympic
Sprinter• Horse at Full Gallop• Race Car• Fighter Jet• Space Shuttle• New Horizons Probe (Fastest Man-Made
Object)
Momentum• 28mph
• 50mph• 240mph• 1,000mph• 17,000mph• 52,000mph
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 @ 100mph
Across United States 30hrs To the Moon 14 Weeks
Last Planet (Neptune) 3100 Years
Light Years
75 Times in 1sec
Moon and Back 2secs Sun to Earth 8min old when reaches
Light Years- Unit of measurementContext• 186,000mps• 670,000,000mph• 6,000,000,000,000/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 for 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 credits1. http://www.antonine-education.co.uk/New_items/MUS/images/M
aking6.gif2. http://www.geocities.com/researchtriangle/campus/6791/einstei
n12.jpg3. http://abyss.uoregon.edu/~js/glossary/wave_particle.html4. http://www.astro.princeton.edu/~gk/A402/electromagnetic_spec
trum.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-headset.j
pg8. http://www.stuffintheair.com/radar-real-time-weather.html9. http://www.imaging1.com/gallery/images/AV%20Night%20vision
%20goggles.jpg10. http://www.global-b2b-network.com/direct/dbimage/50329753/S
tudy_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
Image Credits13. http://farm3.static.flickr.com/2385/2381723771_12548f4b
d1.jpg?v=121742987914. http://intamod.com.au/images/uv2.JPG15. http://science.hq.nasa.gov/kids/imagers/ems/xrays.html16. http://www.sciencelearn.org.nz/var/sciencelearn/storage/i
mages/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.html19. http://www.aboutnuclear.org/print.cgi?fC=Food20. http://www.roswellpark.org/files/1_2_1/brain_spinal/gamm
a%20knife%204c.jpg
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