Wave Interactions Wave Interactions Reflection occurs when a

Wave Interactions… Reflection: occurs when a wave bounces back after striking a barrier All

$More wave interactions… Refraction is the bending of a wave as it passes at$

$Refraction Sound from liquid to gas Light from gas to solid Light from gas$

$(1) Reflection or (2) refraction A B E C D$

$Wave interactions… Diffraction: the bending of waves around or through an opening; diffraction depends$

$Diffraction Can be more than one opening or can bend around a corner.$

$1) Reflection 2) refraction 3) diffraction 1. Which one bends waves as it moves$

$1) Reflection 2) refraction 3) diffraction A C D B$

Interference: the result of 2 or more waves overlapping. a. constructive interference: increases the

Constructive interference – where the waves cross!

Amplitudes/height add together (build/construct)

Destructive Interference b. destructive interference: decreases the amplitude of a wave

Areas between waves – destructive interference

$1) Diffraction 2) Constructive Interference 3) Destructive Interference B A C$

More on interference waves Can create standing waves Standing wave is a wave that

Interference Waves can be deadly! July 1, 1940 - Tacoma Bridge Accident http: //www.

Resonance Frequency A natural frequency of vibration which can result in a responding vibration

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Wave Interactions

Wave Interactions… Reflection: occurs when a wave bounces back after striking a barrier All waves can be reflected. Reflected sound waves are called echoes. Sunlight is being reflected off of the moon at night. Water waves reflect off a shoreline.

Reflection

$More wave interactions… Refraction is the bending of a wave as it passes at$

More wave interactions… Refraction is the bending of a wave as it passes at an angle from one medium to another. Speed of refraction depends on the medium.

$Refraction Sound from liquid to gas Light from gas to solid Light from gas$

Refraction Sound from liquid to gas Light from gas to solid Light from gas to liquid

$(1) Reflection or (2) refraction A B E C D$

(1) Reflection or (2) refraction A B E C D

$Wave interactions… Diffraction: the bending of waves around or through an opening; diffraction depends$

Wave interactions… Diffraction: the bending of waves around or through an opening; diffraction depends on wavelength and the size of barrier/opening

$Diffraction Can be more than one opening or can bend around a corner.$

Diffraction Can be more than one opening or can bend around a corner.

$1) Reflection 2) refraction 3) diffraction 1. Which one bends waves as it moves$

1) Reflection 2) refraction 3) diffraction 1. Which one bends waves as it moves from one medium to another? 2. Which one is when waves move through the opening of a barrier? 3. Which one is when waves bounce off a barrier? 4. Which one is when waves bend around a barrier?

$1) Reflection 2) refraction 3) diffraction A C D B$

1) Reflection 2) refraction 3) diffraction A C D B

Interference: the result of 2 or more waves overlapping. a. constructive interference: increases the amplitude of a wave

Constructive Interference

Constructive interference – where the waves cross!

Amplitudes/height add together (build/construct)

Destructive Interference b. destructive interference: decreases the amplitude of a wave

Destructive Interference

Areas between waves – destructive interference

Amplitude decreases (destructs)

$1) Diffraction 2) Constructive Interference 3) Destructive Interference B A C$

1) Diffraction 2) Constructive Interference 3) Destructive Interference B A C

More on interference waves Can create standing waves Standing wave is a wave that forms a stationary pattern in which portions of the wave are at the rest position.

Interference Waves can be deadly! July 1, 1940 - Tacoma Bridge Accident http: //www. history. com/videos/tacomanarrows-bridge-collapses#tacomanarrows-bridge-collapses

Resonance Frequency A natural frequency of vibration which can result in a responding vibration – a resonance. Ex. Tuning a piano http: //www. planetscicast. com/view_clip. cfm? cit_id=2776