Question

Welders wear special goggles or face masks with glass windows to protect their eyes from electromagnetic radiation. Name the radiations an write their range of frequency.

Answer 1

Welders wear special goggles or face masks with glass windows to protect their eyes from Ultra Violet Rays (UV-rays).
Frequency range of UV- rays is $7.5\times {10}^{14}\mathrm{to}5\times {10}^{17}\mathrm{Hz}(800\mathrm{THz}\mathrm{to}30\mathrm{PHz})$.