How does energy relate to wavelength in the electromagnetic spectrum?
E = hc/λ
Energy = ('Planck's Constant' X Speed of light in vacuum)/Wavelength
Longer wavelengths have lower energy
This equation shows that the available energy is inversely proportional to the wavelength of the electromagnetic radiation. See also: http://csep10.phys.utk.edu/astr162/lect/light/spectrum.html for a chart of wavelengths, frequencies and energy