Wave Behavior
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Transcript of Wave Behavior
Unit 7 –Lecture 3
ClaritySubstances have varying levels of clarity –
transparent materials allow waves to pass through with minimum or no distortion
ClaritySubstances have varying levels of clarity –
translucent materials allow waves to pass through them with varying degrees of distortion
ClaritySubstances have varying levels of clarity –
opaque materials do not allow waves to pass through themwaves must be
reflected or absorbed
Reflectionoccurs when a wave strikes an object and
bounces off of itechos (& echolocation)image in mirror
ReflectionLaw of Reflection
the angle of incidence [input] must equal the angle of reflection [output]
Mirrorsmirrors must be smooth so all the angles line
up to make a clear picture in the reflection [plan(e/ar)]
Smooth Surface Rough Surface
MirrorsConcave
“caved in”light rays, etc., converge in the centermake the image larger or focus energy
MirrorsParabolic
Satellite dishesLighting the Olympic Torch
MirrorsConvex
“curved out”Light rays, etc., spread out from the centerImages look smaller, but cover more area
Mirrors
Refractionbending of a wave as it moves from one
medium to anotherthe image difference is caused by a change
in the speed of the wave
Refraction“edges” of wave “slow down” in a more dense
medium and “speed up” in a less dense mediumbends towards
the “normal” in a more dense medium
away from the “normal” in a less dense medium
Refractiondepends on the
type of mediumthe angle the wave hits the medium
waves of light move faster through air than through water
RefractionLaw of Refraction
RefractionOil & Gasoline Rainbows
because of the different densities of oil, gasoline, water, and air, a rainbow-like refraction can form in puddles near well-traveled parking lots
RefractionLenses act to control the refraction of light to
focus it in a more desirable manner.
Diffractionthe bending of waves around a barrier
if 1 edge, only one curveif 2 edges, both
will bend the wave
Diffraction
Interferencecaused by the passing of two waves through
one anotherhow the waves line up determines how they
will interact
Interferenceconstructive interference –
crests and troughs line up build on one anotherare said to be “in phase”
Interferencedestructive interference –
crests and troughs don’t line uplessen one anothersaid to be “out of phase”
if they are exactly opposite, they will cancel each other out
Interference
HomeworkFINISH YOUR WAVES PACKET
We will be going over it on Monday.
complete worksheet on back of notes
study for upcoming test = Weds next week