do now turn in web quests from last class! take a clicker and a slip of paper; set aside take a...
TRANSCRIPT
![Page 1: Do Now Turn in Web Quests from last class! Take a clicker and a slip of paper; set aside Take a POGIL and complete the ‘WARM UP’ #1-9](https://reader035.vdocuments.mx/reader035/viewer/2022062712/56649c635503460f949116a6/html5/thumbnails/1.jpg)
Do Now
• Turn in Web Quests from last class!• Take a clicker and a slip of paper; set
aside• Take a POGIL and complete the ‘WARM
UP’ #1-9
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Demo
• Fill out the DO NOW portion of your chart
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UV cont.
Is this beautiful? How about this?
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UV cont.
A very bad case of skin cancer Localized skin cancer
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X-Rays
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X-Rays cont.
• INJURY TO THE SKIN AND UNDERLYING TISSUES FROM ACUTE EXPOSURE TO A LARGE EXTERNAL DOSE OF RADIATION IS REFERRED TO AS CUTANEOUS RADIATION INJURY (CRI).
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X-Rays Cont.Full Term fetus (what is wrong with this picture?)
X-Rays were over used many years ago and people were gravely injured….See next slide.
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X-Rays cont.Over exposure of the hand. This is an x-ray technician’s hand. Over-exposed ankle
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Gamma radiation• Gamma Radiation has the shortest wavelength
and the highest frequency in the EM spectrum.
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Are wavelength and frequency directly or inversely proportional?
1 2 3
21%
0%
79%1. Directly2. Inversely 3. Not sure
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Gamma cont.• Best known for the Hollywood blockbuster,
“The Incredible Hulk”. This is of course, fiction!!!!!
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Gamma Cont. Hiroshima and Nagasaki: The Atomic Bombings and Resultant Biological Effects of Radiation
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Gamma cont.
Alpha, beta and gamma penetration Most extreme
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POGIL
• Check in at stop signs!
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Would you say that high frequency or low frequency EM waves are most dangerous?
1 2 3
86%
0%
14%
1. High2. Low 3. Not sure
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Do high frequency EM waves have any benefits?
1 2 3
90%
0%10%
1. Yes2. No 3. Not sure
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Would you rather be exposed to Millimeter wave technology, or backscatter X ray technology, at the airport security
checkpoints??
1 2 3
80%
0%
20%
1. Millimeter wave2. Backscatter X-Ray3. Not sure
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Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads, vibrates mainly in the plane of the reflecting surface.
27.7 Polarization
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Light travels in waves. The fact that the waves are transverse—and not longitudinal—is demonstrated by the phenomenon of polarization.
• If you shake the end of a horizontal rope, a transverse wave travels along the rope.
• The vibrations are back and forth in one direction.• The wave is said to be polarized.
If the rope is shaken up and down, a vertically polarized wave is produced. The waves traveling along the rope are confined to a vertical plane. If the rope is shaken from side to side, a horizontally polarized wave is produced.
27.7 Polarization
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A vibrating electron emits a polarized electromagnetic wave. • A vertically vibrating electron emits vertically polarized light.• A horizontally vibrating electron emits horizontally polarized light.
27.7 Polarization
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An incandescent or fluorescent lamp, a candle flame, or the sun all emit light that is not polarized. The electrons that produce the light vibrate in random directions.
BUT –
When light shines on a polarizing filter, the light that is transmitted is polarized.
27.7 Polarization
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A rope analogy illustrates the effect of crossed sheets of polarizing material.
27.7 Polarization
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Besides sunglasses… what other uses of polarizing filters can you think of?
27.8 Polarized Light and 3-D Viewing
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A pair of photographs or movie frames, taken a short distance apart (about average eye spacing), can be seen in 3-D when the left eye sees only the left view and the right eye sees only the right view.
27.8 Polarized Light and 3-D Viewing
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A 3-D slide show uses polarizing filters. The left eye sees only polarized light from the left projector; the right eye sees only polarized light from the right projector.Each eye sees a different image, and when the brain combines the images, you get a feeling of depth.
27.8 Polarized Light and 3-D Viewing
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Does light travel in a transverse or longitudinal wave?
1 2 3
82%
0%
18%
1. Transverse2. Longitudinal 3. Not sure
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Which pair of glasses is best suited for automobile drivers? (The polarization axes are shown by the straight lines.)
1 2 3
0% 0%0%
1. A2. B3. C
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think!Which pair of glasses is best suited for automobile drivers? (The polarization axes are shown by the straight lines.)
Answer: Pair A is best suited because the vertical axes block horizontally polarized light that composes much of the glare from horizontal surfaces.
27.8 Polarized Light and 3-D Viewing
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Which pair of glasses is best suited for 3D movies? (The polarization axes are shown by the straight lines.)
1 2 3
6%
88%
6%
1. A2. B3. C
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Exit Slip
• Please fill out the exit portion of your slip and turn in
• CLICKERS RETURNED IN ORDER!