Transcript Electromagnetic (EM) Spectrum

Video
•
http://www.youtube.com/watch?feat
ure=player_embedded&v=xZ6XUk7
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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
• 28mph
•
•
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50mph
240mph
1,000mph
17,000mph
52,000mph
Waves…
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Most waves are either
longitudinal or transverse.
Sound waves are longitudinal.
But all electromagnetic waves
are transverse…
Electromagnetic
Waves
▪▪▪▪▪▪
Electromagnetic Waves
Electromagnetic waves
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•
•
•
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
Light Years
Across United States
30hrs
75 Times in 1sec
To the Moon
14 Weeks
Moon and Back
2secs
Last Planet (Neptune)
3100 Years
Sun to Earth
8min old when reaches
Light Years- Unit of
measurement
Context
• 186,000mps
• 670,000,000mph
• 6,000,000,000,000/h
Math
Radio waves
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Longest wavelength EM waves
Uses:
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■
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TV broadcasting
AM and FM broadcast radio
Avalanche beacons
Heart rate monitors
Cell phone communication
Microwaves- second longest
wavelength
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Wavelengths from 1 mm- 1 m
Uses:
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Microwave ovens
Bluetooth headsets
Broadband Wireless Internet
Radar
GPS
Visible light
•
•
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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
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Tiny wavelength, high
energy waves
Uses:
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Medical imaging
Airport security
Inspecting industrial welds
Gamma Rays
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Smallest wavelengths, highest
energy EM waves
Uses
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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 credits
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12.
http://www.antonineeducation.co.uk/New_items/MUS/images/Making6.gif
http://www.geocities.com/researchtriangle/campus/6791/einste
in12.jpg
http://abyss.uoregon.edu/~js/glossary/wave_particle.html
http://www.astro.princeton.edu/~gk/A402/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-h12-bluetoothheadset.jpg
http://www.stuffintheair.com/radar-real-time-weather.html
http://www.imaging1.com/gallery/images/AV%20Night%20visi
on%20goggles.jpg
http://www.global-b2bnetwork.com/direct/dbimage/50329753/Study_Remote_Control
.jpg
http://www.georgiaprismaward.com/The_Prism_Story_files/PRI
SM%20brand%20imagemed.jpg
http://science.hq.nasa.gov/kids/imagers/ems/uv.html
Image Credits
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http://farm3.static.flickr.com/2385/2381723771_12548f
4bd1.jpg?v=1217429879
http://intamod.com.au/images/uv2.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-security1.jpg
http://science.hq.nasa.gov/kids/imagers/ems/gamma.ht
ml
http://www.aboutnuclear.org/print.cgi?fC=Food
http://www.roswellpark.org/files/1_2_1/brain_spinal/ga
mma%20knife%204c.jpg