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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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