1. WAVES Essential Questions:  What is a wave?  How do waves travel?  What are the types of waves?  What are the properties of waves?  What are 4 types of wave interactions?

2. Day 1  The Nature of Waves

3. What are Waves?

4. What is a WAVE?  A wave is any disturbance that transfers energy through matter.  Waves only carry energy, not matter!  Once the wave has moved, the disturbance is gone. The energy carried by ocean waves can break rocks.

5. How do waves travel?  A wave must have MATTER to travel through.  The matter through which a wave travels is called a MEDIUM

6. Mechanical Waves Examples of Mechanical Waves:  sound  air  water  ropes  earthquakes  tsunami waves Mechanical Waves need a medium to travel through. Mechanical Waves can be either Transverse or Longitudinal

7. Electromagnetic Waves Examples of Electromagnetic Waves:  x-rays  radio waves  infrared radiation  microwaves  visible light Electromagnetic Waves do NOT need a medium to travel through.

8. Electromagnetic Waves Electromagnetic Waves are ALWAYS transverse waves.

9. Transverse Waves  waves in which the particles vibrate in an up and down motion ex: light waves http://www.youtube.com/watch?v=UHcse1jJAto&feature=player_detailpage#t=8

10. Transverse Wave

11. Longitudinal Waves  waves in which the particles vibrate back and forth along the path that the wave moves. ex: sound waves http://www.youtube.com/watch?v=aguCWnbRETU&feature=player_embedded

12. Longitudinal Waves Carry energy along the wave

13. Day 2 Properties of Waves

14. Properties of Waves: Amplitude Wave Length Frequency Wave Speed

15. Amplitude  wave height  larger amplitude = more energy

16. Wavelength  distance between 2 crests or troughs  shorter wave length = more energy

17. Frequency (Hertz / Hz)  the number of waves produced in a given amount of time  higher frequency = more energy

18. Wave Speed  speed at which waves travel through a medium

19. Properties of a wave

20. Day 3 WAVE INTERACTIONS

21. Reflection  Waves reflect after hitting a barrier.  all waves can be reflected.  a wave can also be transmitted through a substance.  Reflection – happens when a wave bounces back after hitting a barrier.

22. Refraction  Refraction – is the bending of a wave as the wave passes from one medium to another at an angle.

23. Diffraction  The bending of waves around a barrier or through an opening is known as diffraction.

24. Interference Interference happens when waves overlap  Constructive: amplitude increases  Destructive: amplitude decreases

25. Resonance Resonance – vibration produced in one object that is caused by the vibration produced in another

26. properties _________ can undergo ________ reflection ________ interference types are alwayscan be either do _____need a __________ need a __________ examples x-rays radio waves infrared radiation microwaves visible light sound air water ropes earthquakes tsunami waves

27. properties amplitude wave length frequency wave speed can undergo refraction reflection diffraction interference types Electromagnetic Waves Mechanical Waves are alwayscan be either do NOT need a medium need a medium Transverse Longitudinal examples x-rays radio waves infrared radiation microwaves visible light sound air water ropes earthquakes tsunami waves