Back to Top. 1  These are the waves which are having the lowest frequency in the electromagnetic spectrum. They are given out by transmitter. 2  They are formed as a result of thunder, lightning etc. 3  They are used in communication mostly.  They are of four types of radio waves 1  namely: Long wave.  Medium 1  wave. Ultra high frequency  (UHF)
What is the role of arsenic in the mining industry . Arsenic is a naturally occurring element commonly found as an impurity in metal ores, and is produced commercially for use in pesticides, wood preservatives, and , Get Price arsenic - definition of arsenic by Medical dictionary
1 Arsenic is an element and is a naturally occurring mineral found widely in the environment. 2  Arsenic exists in four common valence states. 3  Arsenic is widely used commercially, a fact that increases the risk of overexposure.rsenic is an element and a naturally occurring mineral found widely in the environment. Arsenic mineral ores, orpiment (left) and realgar (right). Environmental sources of arsenic exposure are. Because it is an element, arsenic persists in the environment and does not deteriorate. 1  food, 2  water,