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Give two properties and four uses of ult...

Give two properties and four uses of ultraviolet rays?

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Properties of ultraciolet rays :
(i) These are electromagnetic waves.
(ii) These travel with velocity of `3xx10^(8)" ms"^(-1)` in vacuum.
(iii) These can affect a photographic plate.
(iv) These can be polarised.
Uses of ultraviolet rays :
(i) These are used for sterilizing surgical instruments.
(ii) These are used in burglar alarms.
(iii) These are used in the study of molecular structure.
(iv) These are used to preserve the food stuffs.
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