Suppose the mass of a single $Ag$-atom is $m$. $Ag$ metal crystallises in $fcc$ lattice with unit cell of length $a$. The density of $Ag$ metal in terms of $a$ and $m$ is

  • A
    $\frac{4 m}{a^{3}}$
  • B
    $\frac{2 m}{a^{3}}$
  • C
    $\frac{m}{a^{3}}$
  • D
    $\frac{m}{4 a^{3}}$

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