Wave Interactions Ch 14 Section 3 Pages 472-478 108

Waves interact with other objects and waves They can Reflect Refract Diffract Interference What are the four things a wave can do? 108

Reflection The bouncing back of a ray of light, sound or heat when the ray hits a surface that it does not go through 109

Law of Reflection copy this picture!!! The angle of incidence equals the angle of reflection The normal is a line perpendicular to the surface 109 copy this picture!!!

Diffraction The bending of waves around an edge When waves pass the edge of an object or pass through an opening they spread out as if a new wave were created there 110

Diffraction of Sound 110 Draw only                                                                             

Refraction The bending of a wave front as it passes between two substances in which the speed of the wave differs 111 Animation courtesy of Dr. Dan Russell, Kettering University

Interference The combination of two or more waves May be: Constructive Destructive This one is constructive 112

Constructive Interference The crests of two waves overlap each other Results in a larger wave— A + B add together Also called in phase Lasers use this 112

Shock ABSORBERS Read page 458

Destructive Interference Waves crests and troughs align and result in cancellation Used in anti-noise technology 113

Interference of Light Causes colorful displays Oil slicks on sidewalks Soap bubbles 113

Interference of sound produces beats Band members listen for beats to tell if they are out of tune 108 113

Review