1. Jumpstart & Outro
Objective 11/05/2012 Page 52
SWBAT compare light waves and properties to sound waves through
notes and video clips.
K W L
K-W-L Chart (What you KNOW, WANT to know and LEARNED about
light…….. Go!
2.
3. 1. Why is it that during a
thunderstorm, you see
the lightning, before you
hear the thunder? Or
during fireworks you see
the colorful explosion,
then hear the
<<boom>>?
2. If you see lightning strike
and you count “1, 2, 3…”
seconds, how far away
would the storm be?
1. Sound waves travel
slower than light waves
do! Sound waves
travel 330 m/s through
the air, while light
waves travel 300
million m/s
2. The storm would be 3
miles away
4. • 3.5- THE STUDENT
WILL RECOGNIZE
THAT LIGHT IS A
FORM OF ENERGY.
[P8C1, P8C3]
• Light- a special
type of wave that
carries energy
• Light is an electromagnetic wave. It
does not need a medium in order to
travel.
– Can travel in a vacuum (as well as
air, water, glass)
– Travels through space
– Speed: 300 million m/s
• Speed of light: written as c
• E = mc2
• Light Ray: narrow beam of light
that travels in a straight line
– Is slowed down and even stopped by
matter (opposite from sound!)
5. Light vs. SoundSound Light
Type of wave
Travel in Vacuum?
Speed
Speed vs. Medium
Sensation Produced
Variations in
Sensations Produced
Wave Diagram
Longitudinal
No, Mechanical wave
~340 m/s (in air)
1,100 feet per second
More elastic/Denser medium =
Greater speed of sound
Sound travels through all substances
Hearing
Low frequency = low pitch note
High frequency = high pitch note
Transverse
Yes, Electromagnetic wave
300 million m/s (in vacuum)
186,000 miles per second
Light 1/3 slower in water than in
air.
Light cannot pass through opaque
materials
Seeing
Low frequency = red light
High frequency = violet light
6. “The Magic of Sight—How Our Eyes Work”
Video Guide- Page 1 Follow-Up Video Questions
• What purpose do cones play in helping you to see?
• What purpose do rods play?
– Why does everything look black & white at night?
• Why do you think cats might see better in the
night?
– The cat has an increased number of rods. In
humans, 4 out of 5 light-sensitive cells in our retinas
are rods, in cats, 25 out of 26 cells are rods.
• Why might dogs see limited colors (just more than
black and white)?
8. July 11, 1910 - The New York Times
• When light energy is absorbed, it is actually
converted into heat energy!
9. What happens to light rays when they hit an
object?- Page 2
• 3.4- THE STUDENT WILL
DIFFERENTIATE AMONG
REFLECTION, REFRACTION,
AND ABSORPTION OF WAVES.
[P8C2]
• When light rays hit an
object, they are either:
– Reflected
– Absorbed
– Transmitted (pass through
the object)
• What you see of an object
depends on how the
surface of it reflects light
10. Types and Behavior of Light
Different objects allow different amounts of
light to pass through them
The amount of light that passes through an
object can be described as:
Transparent (def.)-
You can see objects reflecting on the other side
of a transparent object; no blurriness or skewed
look.
Ex. Windshield glass, air, saran wrap
Translucent (def.)-
Light is bent, so you may see the object through
the material, but it would be blurry.
Ex. Frosted glass, wax paper
Opaque (def.)-
You cannot see through them.
True / False. Most objects are opaque.
Ex. Wood, metal, wool, cotton
12. Types and Behavior of Light
Video Guide- Transparent, Translucent, and Opaque
1. When light strikes an object that is transparent it goes right
through.
2. Translucent materials will let some of the light through, but they
bend the light so it is hard to see what is on the other side.
3. Most objects are opaque which means they do not allow any light to
go through them.
4. The Persistence of vision lets us see the whole image, even though
the reflected light comes to us in pieces.
3.8- THE STUDENT WILL EXPLAIN THAT AN OBJECT IS SEEN
WHEN light reflected FROM AN object ENTERS THE eye.
Reflection (def.)-
The _way that an object appears, is the COLOR of the light that it
reflects.
13. Jumpstart & Outro
Objective 11/05/2012 Page 52
SWBAT compare light waves and properties to sound waves through
notes and video clips.
K W L
K-W-L Chart (What you KNOW, WANT to know and LEARNED about
light…….. Go!
14. Jumpstart
Objective 11/08/2012 Page 54
Outro
SW relate and apply the properties of light to the EMS through notes.
Answer the following questions about light using the words: “reflect”, “absorb” or
“transmit (pass through)” in your answer.
What do you notice when you wear dark colored clothes outside during the
summer?
Why do you think this is? What do you notice when you wear white, or light
colored clothes in summer? Why do you think this is?
Title of an article published July 11, 1910 in The New York Times:
What is wrong with the thinking of
the people who wrote this article?
What do you think they may have
meant by this statement? Do dark
clothes really keep you cooler?
17. Types and Behavior of Light
Different objects allow different amounts of
light to pass through them
The amount of light that passes through an
object can be described as:
Transparent (def.)-
You can see objects reflecting on the other side
of a transparent object; no blurriness or skewed
look.
Ex. Windshield glass, air, saran wrap
Translucent (def.)-
Light is bent, so you may see the object through
the material, but it would be blurry.
Ex. Frosted glass, wax paper
Opaque (def.)-
You cannot see through them.
True / False. Most objects are opaque.
Ex. Wood, metal, wool, cotton
19. Types and Behavior of Light
Video Guide- Transparent, Translucent, and Opaque
1. When light strikes an object that is transparent it goes right
through.
2. Translucent materials will let some of the light through, but they
bend the light so it is hard to see what is on the other side.
3. Most objects are opaque which means they do not allow any light to
go through them.
4. The Persistence of vision lets us see the whole image, even though
the reflected light comes to us in pieces.
3.8- THE STUDENT WILL EXPLAIN THAT AN OBJECT IS SEEN
WHEN light reflected FROM AN object ENTERS THE eye.
Reflection (def.)-
The _way that an object appears, is the COLOR of the light that it
reflects.
20. EMS
• What is the EMS? • All of the frequencies of
electromagnetic
radiation
– Visible light
– X-Rays
– Microwaves
– Etc…
21. EMS
• How do we use the
EMS?
• Communications
• Diagnosing illness
• Cooking food
• Seeing invisible stuff
• Seeing, in general!
22.
23. Jumpstart
Objective 11/08/2012 Page 54
Outro
SW relate and apply the properties of light to the EMS through notes.
Answer the following questions about light using the words: “reflect”, “absorb” or
“transmit (pass through)” in your answer.
What do you notice when you wear dark colored clothes outside during the
summer?
Why do you think this is? What do you notice when you wear white, or light
colored clothes in summer? Why do you think this is?
Title of an article published July 11, 1910 in The New York Times:
What is wrong with the thinking of
the people who wrote this article?
What do you think they may have
meant by this statement? Do dark
clothes really keep you cooler?
24. Bucket List - Page 3
1. With your table partners, use your procedure to sort the items
into groups based on properties having to do with reflection,
absorption, or transmission of light. Then, discuss with your
group why each item is sorted into the pile that it is.
2. In the data table, write the name of the material tested, and the
observation of how light interacts with the object (i.e. reflects
light, absorbs light, transmits light, does not transmit light, etc.)
3. Based on the diagrams on page 2, try to classify each material
based on its properties, and record as your conclusion
(transparent, translucent, opaque).
4. Draw conclusions based on your data. Classify based on the best
transmitter of light, and the worst transmitter of light.
Material Tested Observation Conclusion
25. Opaque, Transparent, Translucent Lab- Page 3
• Different objects allow different amounts of light to pass
through them
• The amount of light that passes through an object can be
described as:
– Transparent
– Translucent
– Opaque
• Now, using the
diagrams
provided, write a
hypothesis
(IF, THEN, BECAUSE)
for
transparent, translu
26. Opaque, Transparent, Translucent Lab-
Designing the Experiment- Page 3
• Materials in your bucket: (you
may need to add some lines
to your materials section of
the lab)
– Balloon
– Black paper
– Cardboard
– Plastic sandwich bag
– Wax paper
– Metal soup can
– Graduated cylinder
– Yellow plastic wrapping
paper
– White tissue paper
– Blue felt fabric
– Cling (Saran) wrap
– Protractor
– Plastic cup (2 kinds)
– Plastic grocery bag
– Plastic colored square w/ handle
– Mirror
– Straw
– Lab apron
– Optional: Choose two of
your own objects to use!
27. Procedure- Page 3
• Are there things you do every night
before you go to bed? Are there things
you do every morning when you wake
up?
• What is your “procedure” for what you
do before you go to bed, and in the
morning?
1. Brush teeth
2. Wash face
3. Make Lunch
4. Set alarm Clock…
5. Etc.
– How do you dry off after a shower?!
• You must write a procedure for how
you are going to test and classify each
item as either transparent, translucent
or opaque.
Editor's Notes
Why do you see lightning from a distant storm before you hear thunder? The thunder is produced after the lightning., Your eyes react faster than your ears., Light travels faster than sound., Sound travels faster than light. How fast does light travel in a vacuum? 300 m/s, 330 m/s, 3300 m/s, 300 million m/s, 300 billion m/s
