The activity of a certain radioactive sample is 128 mCi. If the decay constant of the material be 6.93 per hour then its activity after 30 minutes will reduced.(a) 4mCi(b) 12.8 mCi(c) 16 mCi(d) 32 mCi
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Iron is a chemical element in the periodic table that has the symbol Fe and atomic number 26. Iron is group 8 and period 4 metal. A typical iron atom has 56 times the mass of a typical hydrogen atom. Iron is the most abundant metal, and is believed to be the tenth most abundant element, in the universe
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