Welders wear special glass goggles or face masks with glass windows to protect their eyes from large amout of ultraviolet rays produced by welding arcs. Frequency range of ultraviolet radition is from 7 × 10¹⁴ Hz to 5 × 10¹⁷ ...
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Welders wear special glass goggles or face masks with glass windows to protect their eyes from large amout of ultraviolet rays produced by welding arcs. Frequency range of ultraviolet radition is from 7 × 10¹⁴ Hz to 5 × 10¹⁷ ...