Physical Science: Chapter 15: Section 3

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Presentation transcript:

Physical Science: Chapter 15: Section 3 Wave Interactions

Physical Science: Chapter 15 Wave Interactions Reflection Bouncing back of a wave as it meets a surface or boundary.

Physical Science: Chapter 15 Wave Interactions Reflection: Law of Reflection The angle of incidence is equal to the angle of reflection Works for light, sound, water waves

Physical Science: Chapter 15 Wave Interactions Reflection

Physical Science: Chapter 15 Wave Interactions Reflection

Physical Science: Chapter 15 Wave Interactions Diffraction: The bending of a wave as it passes through an opening.

Physical Science: Chapter 15 Wave Interactions Diffraction: It can also happen with light.

Physical Science: Chapter 15 Wave Interactions Refraction: The bending of waves as they pass from one medium into another.

Physical Science: Chapter 15 Wave Interactions Refraction:

1). What does the Law of Reflection state? Mini-Quiz # 5 1). What does the Law of Reflection state? 2). What are the TWO kinds of reflection? 3). What is the difference between reflection and refraction? 4). What is the difference between refraction and diffraction?

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 5 1). What does the Law of Reflection state? The angle of incidence equals the angle of reflection. 2). What are the TWO kinds of reflection? Specular and diffuse

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 5 3). What is the difference between reflection and refraction? Light “bounces off” a surface in reflection and bends as it goes into another medium.

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 5 4). What is the difference between refraction and diffraction? In refraction the light bends because it goes into a different medium; in diffraction the light bends because it passes through an opening.

Physical Science: Chapter 15 Wave Interactions Wave Interference The combination of two or more waves existing at the same time and place.

Physical Science: Chapter 15 Wave Interactions Constructive interference Two or more waves combine so that the resulting wave (crests and troughs) is bigger than the original waves.

Physical Science: Chapter 15 Wave Interactions Wave Interference Constructive interference

Physical Science: Chapter 15 Wave Interactions Wave Interference Constructive interference

Physical Science: Chapter 15 Wave Interactions Destructive interference Two or more waves combine so that the resulting wave (crests and troughs) is smaller than the original waves.

Physical Science: Chapter 15 Wave Interactions Wave Interference Destructive interference

Physical Science: Chapter 15 Wave Interactions Wave Interference: Destructive interference

Physical Science: Chapter 15 Wave Interactions Sound Wave Interference: Beats A pattern of louder and softer sounds created by interference.

Physical Science: Chapter 15 Wave Interactions Wave Interference: Standing Waves A formed wave caused by interference that APPEARS not to move along the medium.

Physical Science: Chapter 15 Wave Interactions Wave Interference: Standing Waves Nodes (destructive interference) are regions of no displacement Anti-nodes (constructive interference) show maximum displacement.

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 6 1). Describe the difference between constructive and destructive interference. 2). What are the two parts of a standing wave?

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 6 3). What causes “beats?” 4). How many nodes in this standing wave? 5). How many anti-nodes?

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 6 1). Describe the difference between constructive and destructive interference. In constructive interference the (crests and troughs of) waves add together, making bigger waves; in destructive interference they cancel out, making smaller waves.

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 6 2). What are the two parts of a standing wave? Nodes (from destructive interference) and anti-nodes (from constructive interference)

Physical Science: Chapter 15 Wave Interactions Mini-Quiz # 6 3). What causes “beats?” A pattern of constructive and destructive interference in sound waves. 4). How many nodes in this wave? THREE 5). How many anti-nodes? FOUR