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Spectrum first: that's a range.

The range here is the range of the energies of photons (light quanta).

So we're talking about photons,

which are always moving--at the speed of light.

A moving photon can be thought of as two sine waves

stretched out in its direction of travel.

(The planes of the two waves are at right angles,

and they are ninety degrees out of phase.)

One of the waves represents (signed, i.e., plus and minus) electric field intensity;

the other, magnetic field intensity.

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