T ypes of wave interactions Reflection Refraction Diffraction Interference Reflection The bouncing back of a wave when it hits a surface NOTE When waves hits a substance some of it is transmitted and some of it is reflected ID: 643961
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Wave InteractionsSlide2
Wave Interactions
T
ypes of wave interactions
ReflectionRefractionDiffractionInterferenceSlide3
Reflection
The bouncing back of a wave when it hits a surface.
* NOTE: When waves hits a substance some of it is transmitted and some of it is reflected.
Transmitted means to pass through
This is why we can see objects and hear echoes.
Slide4
Angles
Angle of incidence – the angle between an incoming wave and an imaginary line drawn perpendicular to the surface of the barrier or new medium
Angle of reflection – the angle between a reflected wave and an imaginary line drawn perpendicular to the surface off the barrierSlide5
Refraction
The bending of waves as they pass through different mediums that cause the speed of the wave to change.
PrismSlide6
Diffraction
Change of direction of a wave when it hits an obstacle or edge.
Sound diffracts well around corners
Light does not diffract as much because their wavelengths are shorterSlide7
DiffractionSlide8
Double Slit Experiment
First conducted in 1801 by Thomas Young
Light passed through a barrier with two slits (before it usually passed through a single slit to make the light coherent)
The light diffracted through each slitCreated interference patternSlide9
Interference
When 2 or more waves combine
Two objects can’t occupy the same space at the same time, but waves can.
There are 2 types of interference
Constructive interference
Destructive interferenceSlide10
Constructive Interference
When the crest and trough of different waves match
They combine to make a wave with larger amplitude
Suppose you make two wave pulses on a stretched string, one comes from the left and one comes from the right. When the waves meet, they combine to make a single large pulse.Slide11Slide12
Destructive Interference
When the crest of one wave meets the trough of another
The results are a smaller amplitude or no amplitude
What happens when one pulse is on top of the string and the other is on the bottom? When the pulses meet in the middle, they cancel each other out. Slide13Slide14
Standing Waves
When waves combined they look like they are standing still, but are not.
It is a combination of constructive and destructive interferenceSlide15
Standing Waves
Nodes: any part of a standing wave that remains stationary.
Antinodes: The positions on a standing wave where the largest amplitudes occur.