1. The document outlines an 8 minute class activity where students will complete warm-up questions with their partner, take guided notes on sound waves and electromagnetic radiation, and use light and sound as tools.
2. The next section discusses how echolocation, sonar, and ultrasound use reflected sound waves and how lasers produce coherent, monochromatic light through stimulated emission.
3. Applications of lasers and other electromagnetic waves are then outlined, including cutting, surgery, barcodes, communications, and disinfection. The class will end by working with partners on a joke activity.
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Lesson 13 new content
1. 1. Complete Warm-Up for April 9th. Work
with your shoulder partner first. Then
swap and compare answers with the rest
of your team.
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2. The team with the most correct answers
are “King/Queen for the day” and the
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rolling chairs.
3. Get your journal ready. Add one page of
guided notes to the next available page.
4. Time Limit: 8 minutes
5. Echolocation is the use of reflected
sound waves to determine distances
or to locate objects. Some animals
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use echolocation to navigate and to
find food. Examples of animals
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using echolocation would include
bats, dolphins, porpoises, and
whales.
7. Sonar is a system that uses
reflected sound waves to detect
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and locate objects under water.
Some uses of sonar includes
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mapping the ocean floor and
locating sunken ships
8. Ultrasound waves can be sent into the
human body. Different parts of the
body reflect sound waves differently.
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The reflected waves are collected by
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a computer. The resulting images can
be used to see the image a fetus, to
look for gallstones, and to look for
harmful tumors.
12. Is this what you think of when I say the word „laser‟?
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13. ight
mplification of = strengthened
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timulated (atoms emit light when
exposed to
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electromagnetic radiation)
mmision of
adiation
14. Characteristics of Laser light
•Laser light consists of light
waves that all have the same
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wavelength or color.
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(monochromatic)
15. Characteristics of Laser light
The waves are coherent. (It is
“organized” -- each photon
moves in step with the others.)
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All of the crests of the waves
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align with one another.
17. Production of Laser light
Lasers can be made from gases,
liquids, and solids. Laser
medium is placed in a tube with
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a mirror at one end and a partial
mirror at the other end.
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18. Production of Laser light
The medium is “excited or
charged” by an electric current.
Excited atoms give off photons.
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The photons bump into other
atoms which then give off
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photons “in sync” with the
colliding photons.
19. Production of Laser light
When photons travel back and
forth between the two mirrors
until a coherent beam passes
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through the partial mirror.
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34. Ultraviolet Waves Uses
1. disinfect medical equipment
2. detect forged bank notes
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35. Today‟s Closing Activity…
Work with your shoulder partner to
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complete “Joking Around”. Your correct
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answers will give you the response to
the joke.
