2. What is a Wave? Chapter 10 Section 1 Glencoe Pages 288-293

3. I. Types of waves A. What is a wave? 1. Wave – a disturbance that carries energy 1. Wave – a disturbance that carries energy through matter or space through matter or space  the matter moves very little  the energy moves

4. Most waves travel through a medium 2. Most waves travel through a medium a. medium – matter through which a a. medium – matter through which a wave travels wave travels  ripples in a pond move through water  sound waves travel through the air

5. Mechanical waves b. Mechanical waves – waves that require a medium to travel medium to travel  almost all waves are of this type

6. Electromagnetic waves c. Electromagnetic waves – waves caused by electric and magnetic fields that do not require a medium  Electromagnetic spectrum of waves, consisting of: consisting of: Radio waves, Microwaves, Infrared waves, Visible light, Ultraviolet waves, X-rays, and Gamma rays Radio waves, Microwaves, Infrared waves, Visible light, Ultraviolet waves, X-rays, and Gamma rays

7. Electromagnetic waves

10. Wave Energy 3. Waves transfer energy  energy is the ability to do work  waves have energy therefore waves can do work example:water waves on a boat

11. Wave Energy Example: light waves on the eyes

12. Wave Energy Example: sound waves on your eardrum *Bigger waves carry more energy *Bigger waves carry more energy

13. Wave Energy 4. Energy may spread out as a wave travels - sound waves, ripples in a pond move out in circular patterns called wave fronts, in circular patterns called wave fronts, and get bigger farther from the source and get bigger farther from the source and the energy spreads out along the and the energy spreads out along the entire wave front entire wave front

14. B. Vibrations and waves 1. Most waves are created by a vibrating object object 2. Vibrations involve a transformation of transformation of energy, generally energy, generally between potential between potential and kinetic and kinetic

15. C. Transverse and longitudinal waves 1. Particles in a medium can vibrate up and down or back and forth and down or back and forth 2. Waves are classified by the direction of particle movement particle movement

16. Transverse and longitudinal waves 3. Transverse waves – waves causing the particles of the medium to vibrate perpendicular to the direction the wave is traveling. Ex. Crowd doing the wave, light waves

17. Transverse and longitudinal waves 4. Longitudinal waves – waves causing the medium particles to move parallel to the wave’s direction of travel  squeezing together (compression)  squeezing together (compression)  spreading apart (rarefactions)  spreading apart (rarefactions) ex. Sound waves

18. Surface waves 5. Surface waves – occur at boundaries between different mediums  air and water - these waves move both in a transverse and a longitudinal way.