The actual (physical) particle unit of light, as the electron is of
electric charge and the atom and molecule are of matter. Light has both
wave properties and particle properties. Violet light has relatively
short wavelength and higher energy in its photons; red light has longer
wavelength, lower-energy photons. The wavelength and/or energy spectrum
of the sun extends in both directions beyond the visible range of light,
of course, and the silicon module solar cell can capture some energy in
both of these invisible zones. Photons not captured by the cell are
either reflected or converted to heat in the solar array.
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