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
Answer Posted / orion
infra-red rays were first detected by?
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