1. WAVES THROUGH MEDIA
SC.7.P Recognize that light waves, sound waves, and other waves move at different speeds in different materials.
ALSO ASSESSES: SC.7.P.10.2 Observe and explain that light can be reflected, refracted, and/or absorbed.
Essential Question:
How are light and sound waves affected by the different media they travel through?

2. BELL RINGER
While attending a baseball game of his favorite major league team, John notices that he can see the batter hit the ball before he hears the crack of the bat. Which of the following statements best explains why there is a time lapse between seeing the baseball hit and hearing it?
A. Eyes reacting to stimuli faster than ears do.
B. Light waves travel in a more direct path than sound waves.
C. Sound waves travel more slowly in the air than light waves do.
D. Sound waves from other sounds cause interference with sound waves
from the bat.

3. VIDEO https://www.youtube.com/watch?v=uhEaoaZ2v0w Brainpop: “Waves”
Brainpop: “Sound”
GIZMO: “Longitudinal Waves”, “Basic Prism”

4. INTERACTIVE JOURNAL “I DO”

5. 3 Media: Solids, Liquids, and Gases Sketch the molecular arrangement on the back of your notes.

6. LONGITUDINAL WAVES
A SOUND wave that forms by the compression of molecules as it travels through a medium.
Sound causes compression waves from side to side in matter.
The closer the molecules, the faster sound can travel.

7. TRANSVERSE WAVES A light wave travels as Electromagnetic Radiation
Light travels the fastest when there is no matter in the way.
Light will change speed as it moves from one medium to another.

8. REFLECTION
Reflection is when a light wave bounces off a surface and changes its direction.
Reflected sound are
called echoes.

9. REFRACTED
Refraction – When light passes from one form of matter to another, it changes speed. Therefore, the image you see will be distorted.

10. When light hits a surface, some of it is absorbed, or taken in.
ABSORPTION
When light hits a surface, some of it is absorbed, or taken in.
When light is absorbed, it is transformed from light energy to heat energy.

11. Left Side: “WE DO”

12. REVISITING THE BELL RINGER
While attending a baseball game of his favorite major league team, John notices that he can see the batter hit the ball before he hears the crack of the bat. Which of the following statements best explains why there is a time lapse between seeing the baseball hit and hearing it?
A. Eyes reacting to stimuli faster than ears do.
B. Light waves travel in a more direct path than sound waves.
C. Sound waves travel more slowly in the air than light waves do. *
D. Sound waves from other sounds cause interference with sound waves from the bat.

13. YOU DO TIME!

14. YOU DO #1
Brady notices that when he places a straw in a glass of water, the image of the straw in water and the image of the straw outside of the water do not match up. What is the reason for the difference in how the straw looks above and below the water?
Light travels faster through water, refracting the image
The surface of the water reflects the image of the straw
Light travels faster through air, refracting the image of the straw
The light is reflected several times in the glass, creating a false image
Correct Answer: C

15. YOU DO #2
In science class, you listen to the sound of a tuning fork after it is hit against a cork. When you place the tuning fork to one end of a piece of wood and your ear to the other, you notice that the sound becomes high pitched. What happened to the sound waves as they went through the wood?
They slowed, due to a high pitch echo
They slowed, due to more matter in the wood
They sped up, creating a higher frequency
They sped up, creating a higher wavelength
Correct Answer: C

16. YOU DO #3
Sound waves need a medium to move through in order to keep moving. Through which of the following would sound travel the slowest?
Air
Metal
Water
Wood
Correct Answer: A

17. EXIT TICKET
How are light and sound waves affected by the different media they travel through?