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A crystal has a coefficient of expansion 13 x 10^-7 in one direction and 237 x 10^-7 in every direction at right angles to it. Then the cubical coefficient of expansion is

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475x 10^-7

462 x 10^-7

257 x 10^-7

244 x 10^-7

answer is C.

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Detailed Solution

$\begin{array}{l} γ = α_{1} + α_{2} + α_{3} \\ = 13 \times 10^{- 7} + 231 \times 10^{- 7} + 231 \times 10^{- 7} \\ = 475 \times 10^{- 7} \end{array}$

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