c=299,790 km/sec or about 185,000 mi/sec
Maxwell (1850's) showed that light is energy carried in the form of opposite but supporting
electric and magnetic fields in the shape of waves, i.e. self-propagating electromagnetic
waves.
The wavelength of the light determines its characteristics. For example, short wavelengths
are high energy gamma-rays and x-rays, long wavelengths are radio waves. The whole range
of wavelengths is called the electromagnetic spectrum.
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