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
When dealing with arsenic in the environment the relation of sulfide mining and As hazards is quite evident and industry must provide (known) methods to prevent the risks. However, the less obvious threat of As release hidden in oxidizing environment is of concern likewise, the more so as it is much more challenging to handle.