PS4.2 Wave Interactions

Focus Question
How do waves behave?

Learning Intention
Compare wave behaviors that need a medium or can go through space.

Success Criteria
Draw examples of wave behaviors.
Use simulations to describe wave behaviors.

PS4.2
Compare and contrast mechanical waves and electromagnetic waves based on refraction reflection, transmission and absorption and their behavior through a vacuum and various media

Go to your Waves Idea Tracker

Focus Question

How do waves behave?

​Wave Interactions
Fill in your notes as you watch the video.

Multiple Choice

What type of wave behavior is pictured above?

• Refraction

• Absorption

• Reflection

• Diffraction

Multiple Choice

What type of wave behavior is pictured above?

• Refraction

• Reflection

• Absorption

• Diffraction

Multiple Choice

What is the definition reflection?

• 
  The bending of waves as they enter a new medium

• The bending of waves as they pass through openings or around corners

• 
  Bouncing back of waves from a surface that it can’t pass through

• When two interfering waves have a displacement in the same direction, two crests and two troughs overlap. Increased amplitude.

The angle of incidence (angle coming in) is going to be equal to the angle of reflection (angle going out) - Law of Reflection

Reflection
is the bouncing back of a ray of light, sound, or heat when the ray hits a surface it doesn't go through.

​Reflection of Sound- Echoes!

Refraction depends upon density of medium.

Greater densities mean greater refraction (ie. more bending

Refraction
when a wave changes direction (& speed) as it passes from one medium into another

What happens to the ray as it enters the water with less of an angle?

Refraction

is when a wave bends around an object or passes through an opening.

Diffraction

Constructive Interference

interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction​

Destructive Interference

interference that occurs at any location along the medium where the two interfering waves have a displacement in the opposite direction​

Multiple Choice

What type of interference is being shown in the picture?

• Constructive

• Destructive

Multiple Choice

What type of interference is occurring in the picture?

• Constructive

• Destructive

Transmission
When a wave travels through a medium or into anew medium

​Transmission

​Absorption
The transfer of energy from a wave to a medium. The wave then transfers its energy to the object.

​Reflection and absorption cause us to see colors

Standing Waves: Interference
when two overlapping waves traveling in opposite direction have the same frequency

Points that have no displacement Nodes
Larger, moving displacements Antinodes
(max. amplitudes)
String instruments

Resonance
is a phenomenon that occurs when a vibrating object causes another object to vibrate at a higher amplitude.

Multiple Choice

The illustration shows a light ray striking an object. In the illustration, the light ray striking the object is

• absorbed

• stopped

• reflected

• refracted

Multiple Choice

A student placed a pencil in a cup of water.  The pencil appears broken because light-

• always travels in a straight line

• makes the water in the glass evaporate

• bends when it passes through water

• reflects the pencil on the water's surface

​Doppler Effect

apparent increase in frequency for observers as the source approaches/moves closer to observer

apparent decrease in frequency for observers as the source recedes/moves away from observer

​Doppler Effect

​is a change in the frequency and wavelength of a wave as the source and observer MOVE.

Doppler Effect: Sound

Longer frequency for observers as train leaves

Shorter frequency for observers as train approaches.

​Doppler Effect: Light

Longer frequency for observers as train leaves = light shifts RED

Shorter frequency for observers as train gets closer - Light shifts BLUE

The Doppler Effect

Multiple Choice

When 2 waves meet and create a bigger wave

• 
  Constructive Interference

• Destructive Interference

​Bellwork

You have 3 minutes to look over your Wave Behavior Notes on page 37. You will have a Quick Check in a few minutes so this is important!

Multiple Choice

The diagram shows a series of wave fronts approaching an opening in a barrier. Point P is located on the opposite side of the barrier. The wave fronts reach point P as a result of

• resonance

• reflection

• refraction

• diffraction

Multiple Choice

When two waves meet and create a smaller wave

• Constructive Interference

• Destructive Interference

Multiple Choice

What will be the result after these two waves overlap?

• A taller wave

• A wave with no amplitude

• A shorter wave

• 3 waves

Multiple Choice

Two wave pulses with equal positive amplitudes travel on a cord approaching each other. What is the result of the oscillations when the pulses reach the same point?

• It is constructive interference with twice the amplitude

• It is constructive interference with slightly greater amplitude

• The standing wave is produced

• It is destructive interference with zero amplitude

• It is constructive interference with the negative amplitude

​Wave Propagation

​Wave Behavior

1. Open a new tab and go to Schoology.

2. Find the "Microsoft Forms Quizzes" Folder.

3. Click on Quarter 2 Folder to find the Waves Behavior Quiz.

4. You have 6 minutes only as it is timed.
   

Explore It! A

Click on the link below and complete the Explore It sheet. this is due at the end of class.
Follow all directions on the Explore It sheet.
https://phet.colorado.edu/sims/html/wave-interference/latest/wave-interference_all.html

Multiple Choice

To demonstrate the properties of sound and light waves, a student shines a light and

plays a sound on one side of a piece of metal. The table shows observations about the

demonstration.

• Light waves transfer more energy because there are no vibrations in the metal, but the sound

  waves transfer through the metal using vibrations.

• Sound waves transfer more matter because the waves can be detected on the other side of

  the metal, but the light waves are absorbed by the metal.

• Both sound and light waves travel without moving particles because the temperature

  increases, but light waves transfer more energy.

• Both sound and light waves transfer energy because the temperature increases, but sound

  waves transfer energy by moving particles

​Bellwork

You have 3 minutes to look over your Wave Behavior Notes on page 38. You will have a Quick Check in a few minutes so this is important!

​Wave Behavior

1. Open a new tab and go to Schoology.

2. Find the "Waves" Folder.

3. Click Waves Behavior Quiz.

4. You have 8 minutes only as it is timed.
   

Focus Question
How do waves behave?

Learning Intention
Compare wave behaviors that need a medium or can go through space.

Success Criteria
Draw examples of wave behaviors.
Use simulations to describe wave behaviors.

PS4.2
Compare and contrast mechanical waves and electromagnetic waves based on refraction reflection, transmission and absorption and their behavior through a vacuum and various media

​Watch It!

​Watch the video using the link below and answer the questions:
https://youtu.be/Gx_4dyWL7-Y?feature=shared

Compare It

Do to your next clean page in your notebook.
Draw a veinn diagram and label one side electromagnetic waves and the other Mechanical Waves

Place the words below on the Venn diagram

​Match It and Explore It B

Using your notes and definitions, complete the Match It section. Write the letter next to the corresponding word. DO NOT DRAW LINES TO THE DEFINITION.

Use the link below to answer the Explore It
https://phet.colorado.edu/sims/html/waves-intro/latest/waves-intro_en.html

Multiple Select

Which three examples correctly demonstrate the behavior of sound and light?

• person can hear a television playing in a closed room but cannot see it

• person behind a thick black curtain can see light but cannot hear people on the other side

  of the curtain.

• A car’s headlights are visible to people before the car is close enough to hear

• Two people talking to each other need light to hear each other speak.

• A glass breaks in a restaurant, and people who do not see the glass can hear it break.

10/17-18 BELL WORK ( 8 MINS)

LABEL THE PARTS OF WAVE AND ANSWER QUESTIONS - Glue to Bell work paper when complete.

Focus Question
How do waves behave?

Learning Intention
Compare wave behaviors that need a medium or can go through space.

Success Criteria
Draw examples of wave behaviors.
Use simulations to describe wave behaviors.

PS4.2
Compare and contrast mechanical waves and electromagnetic waves based on refraction reflection, transmission and absorption and their behavior through a vacuum and various media

Wave Behavior Stations

Expectations:
You will have 10 minutes to complete your station.
Work with your group only.
Clean up all Materials at your station.

​Activity/Station Rotations

Lab 1: Scattering
Lab 2: Diffraction
Lab 3: Refraction
Lab 4: Absorption
Lab 5: Reflection
Lab 6: Catch Up- work on any activity from Wednesday not finished and/or any lab not
finished (except Lab 4/5)

Last 5 minutes of class: Exit Ticket - 5 questions on Mastery Connect

​Activity/Station Rotations

Lab 1: Scattering
Lab 2: Diffraction
Lab 3: Refraction
Lab 4: Absorption
Lab 5: Reflection
Lab 6: Practice Questions

If finished with a lab early, work on anything you have not completed.

Last 5 minutes of class: Exit Ticket - 5 questions on Mastery Connect

MASTERY CONNECT QUICK CHECK!

YOU WILL HAVE TEN MINUTES TO COMPLETE YOUR QUIZ!
- If you finish you may work on your wave models or Match It from Wednesday.
-TURN HOMEWORK INTO THE TRAY