Coefficient of linear expansion of a crystalline substance in one direction is 2 × 10^{-4} /{ }^{ci

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10-1.Thermometry, Thermal Expansion and Calorimetry

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The coefficient of linear expansion of a crystalline substance in one direction is $2 \times 10^{-4} /{ }^{\circ} C$ and in every direction perpendicular to it is $3 \times 10^{-4} /{ }^{\circ} C$. The coefficient of cubical expansion of crystal is equal to ........... $\times 10^{-4} /{ }^{\circ} C$

A

$5$

B

$4$

C

$8$

D

$7$

Solution

(c)

$\alpha_1+\alpha_2+\alpha_3=\alpha$

$2 \times 10^{-4}+3 \times 10^{-4}+3 \times 10^{-4}=\alpha$

$\Rightarrow 8 \times 10^{-4} /{ }^{\circ} C =\alpha$

Standard 11

Physics

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