Welders wear special glass goggles or face masks with glass windows to protect their eyes from radiations produced by welding arcs. These radiations are :

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MCQ (Single)Ultraviolet Rays and Their UsesCBSE PYQ

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The electromagnetic waves used to purify water are

MCQ (Single)Ultraviolet Rays and Their Uses

The electromagnetic radiations used to kill germs in water purifiers are called :

MCQ (Single)Ultraviolet Rays and Their Uses

Name the electromagnetic waves which are produced by the following: (i) Radioactive decays of nucleus (ii) Welding arcs (iii) Hot bodies Write one use each of these waves.

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Electromagnetic waves of wavelengths λ₁, λ₂ and λ₃ are used in radar systems, in water purifiers and in remote switches of TV, respectively.

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Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purifier. Name the two sources of these radiations.

TextUltraviolet Rays and Their Uses