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The spectrum below the UV has very short wavelength, and consequently each photon has a very high frequency and carries far more energy than the visible or IR spectrum. This is the x-ray spectrum, and soft x-rays refer to the region just beyond the UV which can readily destroy some molecular bonds. Hard x-rays are at very short wavelengths where photon energies are high enough to penetrate most materials.


Related Terms: Far Infrared, Infrared (IR), Near Infrared, Ultra-Violet (UV), Visible Spectrum (VIS)