1. BELLWORK 3/25/13
Check Extra Credit of the Week!
Answer your Bellwork in your composition book in the inside margin of pg.143.
What do you think of when you hear the word wave? Write a brief description in your composition book of what you think a wave is.
Then write at least 2 sentences describing a time you might have experienced waves.

2. WAVES: is a disturbance that is a transfer of energy through space or a medium.

3. Wave
A wave is a DISTURBANCE that travels through a medium from one location to another
What in the world is a “medium?”
Medium is MATTER
The wave travels through some sort of matter

4. The “Medium” of a Wave…
A medium is the substance or material the wave travels through
Can be a SOLID, LIQUID, or GAS
Example:
Seismic waves (earthquakes) travel through the ground
Ocean waves travel through water

5. Longitudinal vs. Transverse Waves

6. Examples: light waves, water waves electromagnetic waves, and spring
A. Transverse Waves
Examples: light waves, water waves electromagnetic waves, and spring

7. Parts of Transverse Waves
Crest - above the line
Trough - below the line

8. Transverse Particle Motion
Particles or energy moves perpendicular to wave motion

9. Water Waves

10. Check for Understanding…
1. A transverse wave is transporting energy from east to west. The particles of the medium will move_____.
a. east to west only
b. both eastward and westward
c. north to south only
d. both northward and southward

11. B. Longitudinal Waves
Examples: sound waves and spring

12. Parts of Longitudinal Waves:
Compression: place where particles are closest together
Rarefaction: place where particles are furthest apart

13. Longitudinal Particle Motion
Particles or energy moves parallel to wave motion

14. Check for Understanding…
2.A wave is transporting energy from left to right. The particles of the medium are moving back and forth in a leftward and rightward direction. This type of wave is known as a ____.
a. mechanical
b. electromagnetic
c. transverse
d. longitudinal

15. Which Type of Wave Is This?

16. Properties of Waves Amplitude – height above or below rest
Larger amplitude = more energy

17. Wavelength= distance between any two corresponding locations.
Usually measured in one of three ways:
crest to next crest
trough to next trough
from the start of a wave cycle to the next starting point

18. Frequency: number of waves in given amount of time higher frequency = more energy Hz = Hertz

19. High or Low Frequency?

20. Mechanical vs. Electromagnetic Mechanical waves need a medium Electromagnetic waves can travel through empty space or a medium

21. Vacuum
Vacuum is space that is devoid of matter. The word stems from the Latin adjective vacuus for "vacant" or "void".

22. All waves can be categorized as
Mechanical
Travels through some sort of matter
Example: sound travels through air, water, solids but cannot travel through a vacuum (an empty space)
Electromagnetic
Can travel through vacuum (empty spaces)
Example: microwaves
Light waves
Radio waves

23. Let’s make waves…

24. Transverse or Longitudinal

25. Transverse or Longitudinal

26. Transverse or Longitudinal

27. Transverse or Longitudinal

28. Transverse or Longitudinal

29. Transverse or Longitudinal

30. Transverse or Longitudinal

31. Transverse or Longitudinal

32. Transverse or Longitudinal

33. Transverse or Longitudinal

34. Transverse or Longitudinal