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chapter 9
electromagnetic spectrum
26
Science
7th Grade
02/27/2012

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Term
Electromagnetic Wave
Definition
a disturbance that involves the transfer of electric and magnetic energry
Term
electromagnetic radiation
Definition
the energy that electromagnetic waves transfer through matter or space
Term
wavelength
Definition
the distance between the crest of one wave and the crest of the next wave
Term
frequency
Definition
the frequency of a wave is the number of the waves that pass a given point in a certain amount of time
Term
electromagnetic spectrum
Definition
complete range of electromagnetic waves placed in order of increasing frequency
Term
radio waves
Definition
electromagnetic waves with the longest wavelengths and the lowest frequencies
Term
microwaves
Definition
have shorter wavelengths and higher frequencies than radio waves do
Term
infrared rays
Definition
electromagnetic waves with wavelengths shorter than those of microwaves
Term
visible light
Definition
electromagnetic waves that you can see
Term
ultraviolet rays
Definition
electromagnetic waves with wavelengths just shorter than those of visible light
Term
x-rays
Definition
electromagnetic waves with wavelengths just shorter than those of ultraviolet rays
Term
gamma rays
Definition
electromagnetic waves with the shortest wavelengths and the highest frequencies
Term
regular reflection
Definition
occurs when parallel rays of light hit the smooth surface
Term
image
Definition
a copy of the object formed by reflected or refected rays of light
Term
diffuse reflection
Definition
occurs when parallel rays of light hit an uneven surface
Term
plane mirror
Definition
flat sheet of glass that has a smooth, silver colored coating on one side
Term
virtual image
Definition
an image that forms where light seems to come from
Term
concave mirror
Definition
a mirror with a surface that curves inward like the inside of a bowl
Term
optical axis
Definition
imaginary line that divides a mirror in half
Term
focal point
Definition
the point at which rays parallel to the optical axis reflect and meet
Term
real image
Definition
forms when light rays actually meet
Term
convex mirror
Definition
a mirror with a surface that curves outward
Term
index of refraction
Definition
measure of how much a light ray bends when it enters a medium
Term
mirage
Definition
an image of a distant object cause by refraction of light
Term
lents
Definition
curved piece of glass or other transparent material that refracts light
Term
concave lens
Definition
thinner in the center than at the edges
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