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The coefficient of linear expansion of c...

The coefficient of linear expansion of crystal in one direction is `alpha_(1)` and that in every direction perpendicular to it is `alpha_(2)`. The coefficient of cubical expansion is

A

`alpha_(1)+alpha_(2)`

B

`2alpha_(1)+alpha_(2)`

C

`alpha_(1)+2alpha_(2)`

D

None of these

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The correct Answer is:
C
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