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physical object > natural object > particle > boson > carrier boson > photon > ultraviolet > soft ultraviolet
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soft ultraviolet comparison table
Subject is a kind of has definition
ultravioletphotonElectromagnetic radiation "beyond the violet" with wavelengths in the approximate range 100-4000 Å.
soft ultravioletultraviolet 

Next ultraviolet: extreme ultraviolet    Up: ultraviolet