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