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infra-red rays were first detected by?
the intensity level of sound is measured in?
the material used for a fuse wire should?
radioactivity is a property of?
what is the source of electric energy in an artificial
satellite?
the following is used as a lubricant in heavy machines?
supher, bauxite , graphite, phosphorus
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Answer Posted / jibz
1.Infra red rays.....William Herschel
2.intensity........Decibels
3.Material in fuse wire.....Low melting point
4.Radioactivity...Property of z>83.
5.Source of Energy.........Solar cells
6.Lubricant...Graphite
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