A crystal has a coefficient of expansion 13 × 1 0 − 9 in one direction and 231 × 1 0 − 9 in every direction at right angles to it. Then the cubical coefficient of expansion is :

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A crystal has a coefficient of expansion $13 \times 1 0^{- 9}$ in one direction and $231 \times 1 0^{- 9}$ in every direction at right angles to it. Then the cubical coefficient of expansion is :

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Solution:

Volume expansion is the sum along three perpendicular axes.
$γ = (13 + 231 + 231) \times 1 0^{- 9}$
$γ = 4.75 \times 1 0^{- 7}$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

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