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
All arsenic comes as a by-product, and ores are not mined specifically for arsenic. Arsenic is worth studying because of its curious uses, and as an example of an element that stands with one foot in the metals camp, and one foot in the nonmetals camp.rsenic by itself likes to form the tetrahedral molecule As 4, in which each As is bound to the other three covalently (by sharing electrons). Phosphorus does exactly the same thing. As 4 is a yellowish gas that condenses to a yellow, waxy solid with density about 2.0 g/cc. The gas has a characteristic garlic-like odor.