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A domain in ferromagnetic iron is in the form of a cube of side length \( 1 \mu \mathrm{m} \). Estimate the number of iron atoms in the domain. The molecular mass of iron is \( 55 \mathrm{~g} / \mathrm{mol} \) and its density is \( 7.9 \mathrm{~g} \mathrm{~cm}^{-3} \).
(a) \( 8.65 \times 10^{-10} \) atoms
(b) \( 8.0 \times 10^{-13} \) atoms
-(c) \( 8.0 \times 10^{5} \) atoms
(d) \( 8.65 \times 10^{10} \) atoms
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