Different wavelengths carry different amounts of
energy per light particle ("photon"), with blue
being more energetic and red less. However, the
total power output of a beam of light is equal to
the amount of energy per photon *times* the
*number* of photons, so it is quite possible for a
red laser to be more powerful than a blue one, for
Different substances also reflect
or absorb different wavelengths. This is due to
the spacing and energies that bind the atoms
together; wavelengths at critical energies that
excite atoms in the substances will be absorbed,
and different substances are, well, different.
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