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
What is arsenic? Arsenic is an element in the Earthâs crust, and is present in water, air, and soil. It occurs both naturally in the environment and as a result of human activity, including from erosion of arsenic-containing rocks, volcanic eruptions, contamination from mining and smelting ores and previous or current use of arsenic-containing pesticides.