The coefficient of linear expansion of nickel is $13\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}$ . Find its coefficients of areal and cubical expansion?

• A

  $26\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}\text{,}39\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}$

• B

  $2.6\times {{10}^{-7}}^{\circ }{\text{C}}^{\text{-1}}\text{,}3.9\times {{10}^{-7}}^{\circ }{\text{C}}^{\text{-1}}$

• C

  $6\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}\text{,}9\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}$

• D

  $2\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}\text{:}3\times {{10}^{-6}}^{\circ }{\text{C}}^{\text{-1}}$