You are researching on using iron-platinum (Fe-Pt) magnetic particles as a medium for ultra-high density data storage. It is believed that arrays of this iron-platinum has the potential to store trillions of bits of data per square inch which shall meet the goal of a storage capacity of your interest. Assuming the iron (Fe) particles are considered to be
(a) 3 nm in diameter, how many atoms will be present in such particle (b) 6 nm in diameter, how many atoms will be present in such particle?
[Density of iron 7.8g/cm3]