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Question: Answered & Verified by Expert
A crystal has a coefficient of expansion $13 \times 10^{-7}$ in one direction and $231 \times 10^{-7}$ in every direction at right angles to it. Then the cubical coefficient of expansion is
PhysicsThermal Properties of MatterBITSATBITSAT 2020
Options:
  • A $462 \times 10^{-7}$
  • B $244 \times 10^{-7}$
  • C $475 \times 10^{-7}$
  • D $257 \times 10^{-7}$
Solution:
2673 Upvotes Verified Answer
The correct answer is: $475 \times 10^{-7}$
$\begin{aligned} \gamma &=\alpha_{1}+\alpha_{2}+\alpha_{3} \\ &=13 \times 10^{-7}+231 \times 10^{-7}+231 \times 10^{-7} \\ &=475 \times 10^{-7} \end{aligned}$

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