# Chapter 11-Sect. 3 Behavior of Waves. Reflection Reflection-occurs when a wave strikes an object and bounces off of it All waves (including sound, water.

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Chapter 11-Sect. 3 Behavior of Waves

Reflection Reflection-occurs when a wave strikes an object and bounces off of it All waves (including sound, water and light) can be reflected –Ex: mirror reflections/echoes, etc.

Law of Reflection Incident beam—beam striking the object Reflected beam—beam that bounces off the object The line drawn perpendicular to the surface of the object--NORMAL

(more on Law of Reflection) According to the Law of Reflection, the angle of incidence is equal t the angle of reflection ALL REFLECTED WAVES OBEY THIS LAW

Refraction Figure 14—pg. 340 Pencil looks as if it is broken into two pieces Refraction—the bending of a wave caused by a change in its speed as it moves from one medium to another Greater change in speed = greater bend of waves

Refraction of Light in Water Pg. 341-explains how the eye perceives refraction Your vision assumes light rays have traveled in a straight line, whether in water or not

Diffraction When waves strike an object, they can bounce off or be reflected If the object is transparent— refraction Sometimes, waves are both reflected and refracted

More on diffraction Diffraction—occurs when an object causes a wave to change direction and bend around it Diffraction and refraction both cause waves to bend Refraction—waves pass through Diffraction—waves pass around

Diffraction and Wavelength When an obstacle is smaller than the wavelength, the waves bend around it When the obstacle is larger than the wavelength, the waves do not diffract as much, or sometimes not at all

Radio Waves Diffraction affects your radio’s reception AM radio waves have longer wavelengths than FM radio waves AM radio waves diffract around buildings, etc. FM waves do not diffract as much SO: AM radio reception is often better than FM

Interference When two or more waves overlap and combine to form a new wave— interference. Constructive—waves add together Destructive—waves subtract from ea/other as they overlap

Standing Waves A special type of wave pattern that forms when waves equal in wavelength and amplitude, but traveling in opposite directions, continuously interfere w/ea other Nodes—where the two waves always cancel

Resonance The ability of an object to vibrate by absorbing energy at its natural frequency--resonance

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