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Electromagnetic Waves
ICP Chapter 15
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Waves/Sound
Physics
Electromagnetic Waves
9th
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25 Terms
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1
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wave
a rhythmic disturbance that carries energy (NOT matter)
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medium
the matter that the wave travels through
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mechanical waves
must have a medium (ex: sound)
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electromagnetic waves
do not need a medium (ex: light)
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transverse wave
the particles of the medium vibrate perpendicular to the direction of the wave (ex: light, “the wave” in a stadium)
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longitudinal wave
particles of the medium vibrate parallel to the direction of the wave (ex: sound, slinky)
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wavelength
distance from a point on a wave to the same point on the next wave (abbreviated by lambda)
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amplitude
distance from rest position to crest OR trough
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what is amplitude determined by?
the amount of energy in the wave
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frequency (f)
number of waves to pass a given point
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frequency units
waves/second = Hertz(Hz)
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period (T)
the time for 1 wave to pass a given point
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period units
seconds/wave
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wave equation
lambda\*frequency
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reflection
bouncing off of a wave at a barrier
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normal
imaginary line perpendicular to the barrier at the point of reflection
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angle of incidence (i)
angle from the incident wave to the normal
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angle of reflection (r)
angle from the reflected ray to the normal
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law of reflection
i = r
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refraction
the bending of a wave as it passes from one medium to another
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what happens when a wave changes mediums?
it changes speed
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diffraction
bending of a wave around the edge of a barrier
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interference
ability of 2 or more waves to add together to form 1 new wave
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constuctive
makes new wave with a larger amplitude “in phase”
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destructive
cancellation “out of phase”
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