tonnau radio - 1 Longest Wavelength , microdonnau - 2 Second longest wavelength, isgoch - 3 third longest wavelength, gwel-adwy - 4 visible ( middle range), uwch fioled - 5 third shortest wavelength, pelydrau X - 6 second shortest wavelength, pelydrau gama - 7 Shortest wave length, more energy - shorter wave / more frequent, less energy - longer wave / less frequent,

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