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.