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
Share. Arsenic is an element that is extremely toxic to human health. Despite this, or maybe because of it, humans have used arsenic in many capacities-as an insecticide, as a toxic agent of war, and even as a wood preservation.However, its use in countless industrial applications has contributed to pollution at all levels.espite this, or maybe because of it, humans have used arsenic in many capacities-as an insecticide, as a toxic agent of war, and even as a wood preservation. However, its use in countless industrial applications has contributed to pollution at all levels.