lesson 13 new content
TRANSCRIPT
1. Complete Warm-Up for April 9th. Work
with your shoulder partner first. Then
swap and compare answers with the rest
of your team.
2. The team with the most correct answers
are “King/Queen for the day” and the
rolling chairs.
3. Get your journal ready. Add one page of
guided notes to the next available page.
4. Time Limit: 8 minutes
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S8P5:
Students will explore the
wave nature of sound and
electromagnetic radiation.
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Echolocation is the use of reflected sound waves to determine distances or to locate objects. Some animals use echolocation to navigate and to find food. Examples of animals using echolocation would include bats, dolphins, porpoises, and whales.
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Sonar is a system that uses reflected sound waves to detect and locate objects under water.Some uses of sonar includes mapping the ocean floor and locating sunken ships
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Ultrasound waves can be sent into the human body. Different parts of the body reflect sound waves differently. The reflected waves are collected by a computer. The resulting images can be used to see the image a fetus, to look for gallstones, and to look for harmful tumors.
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1.Break up kidney stones or gall
stones
2.Clean jewelry, glassware, or
medical equipment D. G
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ight
mplification of
timulated
mmision of
adiation
= strengthened
(atoms emit light when
exposed to
electromagnetic radiation)
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Characteristics of Laser light
•Laser light consists of light
waves that all have the same
wavelength or color.
(monochromatic)
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Characteristics of Laser light
The waves are coherent. (It is
“organized” -- each photon
moves in step with the others.)
All of the crests of the waves
align with one another.
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Production of Laser light
Lasers can be made from gases,
liquids, and solids. Laser
medium is placed in a tube with
a mirror at one end and a partial
mirror at the other end.
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Production of Laser light
The medium is “excited or
charged” by an electric current.
Excited atoms give off photons.
The photons bump into other
atoms which then give off
photons “in sync” with the
colliding photons.
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Production of Laser light
When photons travel back and
forth between the two mirrors
until a coherent beam passes
through the partial mirror.
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Remove cataracts and
repair the retina
Correct vision by
changing the shape of
the cornea
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Ultraviolet Waves Uses
1. disinfect medical equipment
2. detect forged bank notes