Topic 8 Lesson 2 Wave Interactions

1. Topic 8: Waves and Electromagnetic Radiation Lesson 1: Wave Interactions

2. How do we see things? • Homework Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

3. How do we see things? We see things because they reflect light into our eyes • Homework Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

4. Students will make predictions based on models for how waves change direction. (SEP)How waves interact with other waves.Students will explain the concepts of diffraction, refraction, and reflection. (CCC) The ways that waves interact, including constructive and destructive interference. (DCI) Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

5. New Vocabulary refraction standing wave diffraction node interference resonance A – the bending of waves around an obstacle; can also occur when waves pass through a narrow opening B – the process of two or more waves overlapping and combining to form a new wave C – a point in a standing wave at which the interfering waves always cancel D – The bending of a wave caused by a change in its speed as it travels from on medium to another E – the process by which an object is made to vibrate by absorbing energy at its natural frequencies F – A wave pattern that forms when waves of equal wavelength and amplitude, but traveling in opposite directions, continuously interfere with each other, does not appear to be traveling Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

6. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

7. Reflection If you are one of the last people to leave your school building at the end of the day, you will probably find that the hallways are quiet and empty. When you close your locker door, the sound echoes down the empty hall. Your footsteps also make a hollow sound. Thinking you are all alone, you might be startled by your own reflection in a classroom window. The echoes and your image looking back at you from the window are caused by wave reflection. Without wave reflection, you could not even see the lockers in your school’s hallway. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

8. Refraction Refraction is the bending of a wave caused by a change in its speed as it travels from one medium to another. The greater the change in speed, the more the wave bends. The top panel in the figure at the right shows how a wave refracts when it passes into a material in which that wave slows down. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

9. The wave is refracted (bent) toward the normal. The bottom panel in the figure above shows how a wave refracts when it passes into a medium in which it speeds up. Then, the wave is refracted away from the normal. • Ex: Pencil in glass of water looks like it is bending. Light waves travel faster in air than in water Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

10. What causes the light to bend? What’s different about air and water? DENSITY – the amount of mass in a certain volume of a substance (mass/volume) • WATER • AIR • gas • liquid Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

11. Diffraction Diffraction is the bending of a wave around an object. Diffraction and refraction both cause waves to bend. The difference is that refraction occurs when waves pass through an object, while diffraction occurs when waves pass around an object. All waves, including water waves, sound waves, and light waves, can be diffracted. Diffraction can cause ocean waves to change direction as they pass around an island. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

12. Interference Interference is the process of two or more waves overlapping and combining to form a new wave. This new wave exists only while the two original waves continue to overlap. Two waves can combine through either constructive interference or destructive interference. • After they overlap the two waves continue to travel on in their original form Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

13. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

14. When a straw is placed in water, why does it looks like this? Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

15. When a straw is placed in water, why does it looks like this? • In this case the light rays are slowed down by the water and are bent, causing the straw to look broken. The two mediums in this example are air and water. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

16. Practice. Which term describes the bending of a wave around an object? Reflection Refraction Diffraction Absorption Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

17. Which term describes the bending of a wave around an object? Reflection Refraction Diffraction Absorption Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

18. Circle the correct answers. Which is equal to the angle of reflection? Angle of reflection Angle of refraction Angle of bouncing Angle of incidence Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

19. Which is equal to the angle of reflection? Angle of reflection Angle of refraction Angle of bouncing Angle of incidence Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

20. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

21. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

22. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

23. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

24. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

25. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

26. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

27. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

28. STOP Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

29. STOP Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

30. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

31. Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.

34. 2 min A link on google classroom or a worksheet will be shared with you Vision Masar school is committed to providing a positive, safe and stimulating learning environment that ignites creativity and critical thinking skills to create a generation of self-confidant and innovative individuals who are globally successful. Mission Masar School is committed to delivering high-quality education that empowers learners with profound knowledge and builds up their various skills.