Wave Behavior and ET

HAPPY THURSDAY! • Today’s Objec.ve: PSc.3.2.4 Explain and illustrate the wave interac4ons of reflec4on, refrac4on, diffrac4on, and interference.

REVIEW

• Describe electromagne4c waves.

• How do you think waves interact with each other & their surroundings?

Behavior of Waves • We will focus on the following behaviors:

• Reflec.on To bounce off • Refrac.on To bend To bend when moving around an obstacle • Diffrac.on or passing through narrow opening • Interference Overlap or combine – Construc.ve Increases amplitude – Destruc.ve Decreases amplitude

Reflection • Reflec.on occurs when a wave bounces off a surface that it cannot pass through o Like a ball hiFng a wall that it cannot go through and it bounces back

Reflection • Reflec.on does not change the speed or frequency of a wave, but the wave can be flipped upside down

Refraction • Refrac.on is the bending of a wave as it enters a new medium at an angle

Diffraction • Diffrac.on is the bending of a wave as it moves around an obstacle or passes through a narrow opening

Interference • Interference occurs when two or more waves overlap and combine together

Interference • Construc.ve interference occurs when two or more waves combine to produce a wave with a larger displacement

destructive

constructive

• Destruc.ve interference occurs when two or

more w aves combine to produce a wave with a smaller displacement

Interference

Check for Understanding Each picture illustrates a type of wave behavior, which is which? 4.

5.

2.

Destructive interference

1.

Reflection

3.

Constructive interference

Refraction

Diffraction

WAVE BEHAVIOR REVIEW

Each picture illustrates a type of wave behavior, which is which?

1.

5.

Diffraction Refraction

2.

4.

Reflection

Refraction 3. Destructive Interference

Worksheet • Direc.ons: Complete the worksheet independently – You may use your notebook and textbook – You have 20 minutes – Glue on pg. 107 in notebook

Exit ticket

1. When a wave bounces off a surface that it cannot penetrate, it is called ____________.

2. Give an example of refrac4on.

3. Define diffrac4on.

4. What happens during construc4ve interference?

5. What happens during destruc4ve interference?

Exit ticket key

1. When a wave bounces off a surface that it cannot penetrate, it is called reflec.on.

2. Give an example of refrac4on. When a pencil appears bent in a glass of water.

3. Define diffrac4on. Diffrac.on is the bending of a wave as it passes through a narrow opening or around an obstacle.

4. What happens during construc4ve interference?

A wave with a larger amplitude is produced.

5. What happens during destruc4ve interference? A wave with a smaller amplitude is produced.