2. Bellwork:
Turn in your homework from last night into the drawer in the front of the room. Any homework turned in after the end of bellwork will be considered late and you will complete an alternate assignment at Saturday School
T/F
Waves carry matter as they travel from one place to another
Not all waves move energy
Sound waves can travel where there is no matter
All waves are the same shape and size
Waves that carry more energy cause particles to move a greater distance

3. What are waves? A disturbance that travels through matter or space
They transfer energy from place to place but do not transfer matter.

4. What are mechanical waves?

5. What do waves travel through
Medium – the material through which waves travel.
They travel through types of Matter – solids, liquids or gas but not a vacum (empty Space

7. What are the types of mechanical waves
In transverse – the particles move perpendicular to the energy of the wave
Example – Water waves

8. Longitudinal waves
In longitudinal – the particles move parallel to the direction the wave travels

9. Bellwork What are waves? What are mechanical waves What is a medium?
What are the types of mechanical waves. Draw and label. Include direction of wave, crest, trough, rarefactions and compressions.
Bellwork

10. What are properties of waves
Amplitude - measure of how far particles in the medium are from their normal rest position.
As a wave passes, particles vibrate up and down or back and forth in the medium
A higher amplitude = higher energy
Crests = highest points
Troughs = lowest point

11. What is this wave’s amplitude?

12. How does amplitude effect energy?

13. Amplitude
Which has a larger amplitude A or B? Why?

14. 2 Wavelength
Distance from any point on a wave to the same point later on the wave
Ex crest to crest, or trough to trough.

15. What is this wave’s wavelength?

16. Frequency – number of crests (or troughs) that pass per unit of time
Higher frequency = Higher energy
As the frequency increases the wavelength decreases
As the frequency decreases, the wavelength increases.

17. If 1 second passes, what is the frequency of
Wave A?
Wave B?

18. Wave speed Different types of waves travel at different speeds.
The same type of waves travel at different speeds in different materials.
Temperature also affects the speed at which waves travel.

19. What determines the speed of a wave?
Solid – fastest
Liquid - in-between
Gas – slowest speed

20. What happens to the wavelength as frequency increases?

21. Draw a wave on the grid below
Draw one with twice the amplitude
Draw one with twice the frequency

22. How do waves interact with matter and each other?

23. absorption Transfer of energy by a wave into the medium it is in.
Amount absorbed depends on the type of wave and the type of medium
Darker colors absorb more light energy waves than lighter colors

24. transmission
The passage of light waves through an object

25. How do waves change direction
Reflection
Refraction
diffraction

26. Reflection Bouncing of a wave off a surface.
All types of waves reflect
Light when hit mirror
Sound when hit wall
Law of reflection: when a wave is reflected from a surface, the angle of reflection is = angle of incidence

27. Car –label the type of wave interaction

28. Refraction When a wave changes direction because its speed changes
The light waves slow down as they move from air into water

29. Diffraction
The change in direction of a wave when it travels by the edge of an object or through an opening

30. Lesson 3 – LR1 A. diffraction B. interference C. reflection
Which occurs when a wave changes direction because its speed changes?
A. diffraction
B. interference
C. reflection
D. refraction

31. Lesson 3 – LR3 A. the angle of refraction B. the angle of reflection
According to the law of reflection, the angle of incidence equals which of these?
A. the angle of refraction
B. the angle of reflection
C. the angle of interference
D. the angle of diffraction

32. Lesson 3 - Now
Do you agree or disagree?
5. When light waves strike a mirror, they change direction.
6. Light waves travel at the same speed in all materials.

33. Exit: What factors affect a waves energy?
What is wave energy measured in?
What factors affect a waves speed?
Draw a longitudinal wave and label the compressions and rarefractions.

34. Bellwork:
You just came home from a day at the beach. You swam in the ocean and stretched out in the sunlight. Your friend brought a radio so you could listen to music. When you arrived home, you heated some pizza in the microwave oven. As you waited for it to cook, you turned on the TV, and then the phone rang.
List examples of the waves in the story AND classify as mechanical or electromagnetic

35. What are electromagnetic waves
Electromagnetic – travel through matter and space – Don’t need a medium to travel through
- light waves all travel at the same speed because they don’t have a medium.

36. Wave Animation

37. Bellwork: complete the graphic organizer using the word list below:
transverse waves
wave properties
crest &trough
light waves
sound waves
Frequency
Wave speed
Wavelength
Compression & rarefaction
Amplitude
Period
longitudinal

38. Bellwork: Copy and complete
Word List: transverse longitudinal waves wave properties crest &trough, light waves sound waves, Frequency Wave speed, Wavelength Compression Rarefaction Amplitude Period

40. What is the difference between a mechanical and electromagnetic wave?
What is the difference between a longitudinal and a mechanical wave? (include particle movement and speed in your comparison)
What happens to the speed of a wave if it moves from a gas to a solid?
Through which media do waves travel the slowest? Fastest?
You are floating in a life raft in the ocean. What happens as a wave passes under you? What is the medium the wave is passing through
You are screaming for help from your life raft, what medium does the sound wave travel through?
A wave has a speed of 2cm/sec. Its frequency is 6Hz. Find the wavelength. Use the formula speed = freq. x wavelength

41. Exit