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The coefficient of linear expansion of a...

The coefficient of linear expansion of a crystalline substance in one direction is `2 xx 10^(-4)//”^(@)C` and in every direction perpendicular to it is `3 xx 10^(-4)//”^(@)C`. The coefficient of cubical expansion of crystal is equal to

A

`5xx10^(-4)//"^(@)C`

B

`4xx10^(-4)//"^(@)C`

C

`8xx10^(-4)//"^(@)C`

D

`7xx10^(-4)//"^(@)C`

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