Question

A crystal has a coefficient of expansion 13 x ${10}^{-7}$ $12\times {10}^{-7}{/}^{0}C$ and $10\times {10}^{-7}{/}^{0}C$ in three mutually perpendicular directions respectively$.$ Then the coefficient of cubical expansion of the crystal is

• A. 46 x ${10}^{-7}$
• B. 24 x ${10}^{-7}$
• C. 35x ${10}^{-7}$
• D. 25 x ${10}^{-7}$

Answer 1

The correct option is C 35x ${10}^{-7}$

$\begin{array}{c}\gamma ={\alpha }_1+{\alpha }_2+{\alpha }_3\\ =35\times {10}^{-7}{/}^{0}C\end{array}$

Hence,

option $\left(C\right)$ is correct answer.