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Question

A crystal has a coefficient of expansion 13×107/C in one direction and 231×107/C in every direction at right angles to it. Then the cubical coefficient of expansion is :

A
257×107/C
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B
462×107/C
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C
244×107/C
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D
475×107/C
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Solution

The correct option is C 475×107/C
We know,
Cubical coefficient of expansion = Linear coefficient of expansion in x axis +Linear coefficient of expansion in y axis + Linear coefficient of expansion in z axis
Putting these values we get,
γ=(13+231+231)×107
γ=475×107/C

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