What is the definition of a light wave?
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A disturbance of the electric and magnetic fields of space that transfers energy, and that when absorbed by the human eye, it provides information for the sense of vision.
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google and wikipedia is the best thing for you m8!!! i know the answer but look it up so you get more datail and remember it later!
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Light waves are the very high frequency waves which cause the speed of light.
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∇²E = μϵ ∂²E/∂t²
or
∇²B = μϵ ∂²B/∂t²
or
∇²B = μϵ ∂²B/∂t²