Give two peroperties and four uses of infra-red rays?

Explanation

Properties of infrared waves.
(i) These are electromagnetic waves.
(ii) These travel with a velocity of `3xx10^(8)" ms"^(-1)` in vacuum.
(iii) These can be polarised.
Uses of infrared rays :
(i) These are used in solar water heaters and cookers.
(ii) These are used to treat muscular strains.
(iii) These are used for producing the dehydrated fruits.
(iv) IR photographs are used for weather forecasting.