The coefficient of linear expansion of crystal in x-direction is 6×10−5/oC and that in y and z- directions is 4×10−5/oC. The coefficient of cubical expansion of the crystal is?
A
18×10−5/oC
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B
16×10−5/oC
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C
14×10−5/oC
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D
32×10−5/oC
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