Q.

A crystal has linear coefficient of expansion 9×10−5,12×10−5,7×10−5/K along three mutually perpendicular directions the volume expansion coefficient is

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27×10−5/K

26×10−5/K

21×10−5/K

28×10−5/K

answer is 4.

(Detailed Solution Below)

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Detailed Solution

coefficient of volume expansion of crystal is γ=αx+αy+αz αx,αy,αz coefficient of linear expansion of crystal along mutually perpendicular directions γ=9×10−5+12×10−5+7×10−5 γ=28×10−5/K

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