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-- I have to assume that the '520' figure is also a wavelength in nm.
-- The energy of a photon is proportional to its frequency. That also means
that the energy is inversely proportional to its wavelength. So the photon
with the greater wavelength has less energy.
-- 720/520 = 1.385
The shorter-wave photon has 38.5% more energy than the longer-wave one.
-- 520/720 = 0.722
The longer wave photon has 72.2% as much energy as the shorter-wave one has.
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