1. Warm-up
Review your matter assessment and write down any questions you have and which learning objective you scored the highest on.

2. Warm-up
Pick up your waves pre-test. Finish creating your bars for each objective and list your score and 3 things to be successful.
Also look at your prediction of what a wave is from last

3. Warm-up Be ready for class, I do not have any pencils to lend.
List today’s date above your warm-up.
Write the essential questions and objective for today from the board.
Can you answer any of the questions?
You should to be able to answer most of them after the Bill Nye video.

4. Warm-up
What is a wave?
What do waves transfer?
What are the two types of waves?

5. Write homework in your agenda.
Warm-up
Write homework in your agenda.
Pick up a Bill Nye Question sheet from the front table.

6. Warm-up
Describe the differences between reflection, refraction and diffraction. Give an example of each.

7. Warm-up Open your textbook to the page needed (from your rubric)
Take out your waves book
Continue to work and raise your hand if you need help
Do not leave your seat w/o my permission
If you are finished see me for the next assignment.

8. Warm-up
Be ready for class, have a pencil, your wave notes out and pick up homework from front table.
If you are not done finish wave booklet.
Look over notes-today you will complete the open notes waves assessment
When finished preview the sound chapter in the textbook (section C) OR start on homework.

9. Goal for this unit:
Explain that earthquakes, light and sound are all types of waves with unique properties and that there are differences and similarities between electromagnetic and mechanical waves.
Pre-knowledge Level: ?/33
 Please write three actions you plan to do to be successful in this unit:
Ask for help when needed, review notes and
handouts on a regular basis, focus in class.

10. The Energy of Waves Learning Goals:
Describe how waves transfer energy.
Describe the difference between transverse & longitudinal waves.
Describe the properties of amplitude, wavelength, and frequency.
Compare the properties of waves to the wavelike property of energy in earthquakes, light, and sound.
Describe how waves interact through reflection, refraction, diffraction.

11. Essential questions What is a wave? What is a medium?
What is the difference between a longitudinal and transverse wave?
What are the properties of a wave?
What behaviors do all waves have in common?
What is the difference between reflection, refraction, and diffraction?

12. Nature of Waves
Wave—any disturbance (movement) that transfers energy through _______ or empty ________.
(Mechanical)
Waves move energy by ____________ __________in a medium.
Medium—a substance a wave can travel through; it can be__________________.
Characteristics of Waves: Sound waves
matter
space
vibrating
particles
solid, liquid, or gas

13. Nature of Waves
Waves that need a medium to move are called _________ ______________Examples:
_____________
Seismic waves (earthquakes)
Waves that do NOT need a medium are called _________
__________ ___
Examples:
_______ ______
Microwaves
x-rays
T.V. & radio waves
electromagnetic
waves
mechanical
waves
Sound waves
Visible light
Ocean waves
ocean wave animation

14. Types of waves
All waves transfer ________ by repeated _______________.
_______________waves—particles vibrate in an ________________motion while the energy moves across.
energy
vibrations
Transverse
up-and-down
Particles
Energy
rope example
slow motion

15. ___________ wave—the particles of the medium vibrate back and forth in the same direction the wave energy is moving.
____________ —part of a longitudinal wave where the particles are crowded (pressed) together
Longitudinal
Compression
Particles & Energy

16. Properties of waves
Amplitude—(wave height) distance from the rest position to the crest or trough
Large amplitude=more energy
crest
rest position
trough

17. Wavelength —the distance from any point on a wave to an identical point on the next wave. (crest to crest, trough to trough, compression to compression, rarefaction to rarefaction) Shorter wavelength=more energy

18. Higher frequency= higher energy
Frequency —the number of _________ passing through an area in one _______, measured in _______ (Hz)
waves
second
Hertz
1 Hertz = 1 wave per second
5 waves in 1 second= 5 Hz
Higher frequency= higher energy
Wave speed— speed at which a wave travels =frequency x wavelength
Low frequency-few waves
Per second
Higher frequency—more
Waves per second
1 second

19. Wave property animations
Wave motion: change frequency, wavelength etc…
Characteristics of Waves: Amplitude, Wavelength and Frequency

20. Wave Interactions
Reflection
___________—when a wave _______ __ _ _ _____after hitting a barrier it can’t go through.
bounces
back
All types of waves can be reflected
Example: ______ —a reflected sound wave, sonar
echo
Light waves reflected off an object allow you to see it.
surface

21. White light bends to form a rainbow
_________—the ________ of light waves as they pass through from one medium to another at an angle.
Refraction
bending
When a wave passes from one medium to another, it’s speed and wavelength changes so it _________.
Examples:
White light bends to form a rainbow
bends

22. _________—the change in direction of a wave as it bends around a barrier or opening
Resonance—when two objects vibrate at the same frequency; one object causes _____________________.
Diffraction
another object to vibrate
interactive wave disturbance tutorial

23. A resonating object absorbs energy from the vibrating object and begins to vibrate too.
The 4 month old bridge collapsed during a windstorm with gusts that reached 68 km/h (42 mph). The catastrophe was attributed to faulty design. Instead of allowing the wind to pass through, the suspended girders caught the wind, causing the bridge to buck and roll. The bucking motion earned the bridge the nickname Galloping Gertie. The stronger the wind blew, the more violently the structure oscillated, until it finally broke apart and crashed into the water.

24. Label the wave parts 1 second 0 seconds Type of wave: Longitudinal
Frequency:
____ Hertz 3
wavelength
__________
amplitude
Type of wave:
Transverse
Frequency:
____ Hertz
__________
3.5
wavelength
___________

25. Wave speed Waves Transverse Energy Medium Frequency Amplitude
Longitudinal
Energy
Medium
Frequency
Amplitude
Wave speed
wave simulator