An external pressure \( P \) is applied on a cube at \( 0^{\circ} \mathrm{C} \) so that it is eq....

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An external pressure \( P \) is applied on a cube at \( 0^{\circ} \mathrm{C} \) so that it is equally compressed from all sides. \( K \) is the
\( \mathrm{P} \)
bulk modulus of the material of the cube and \( \alpha \) is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by:
(1) \( \frac{3 \alpha}{P K} \)
(2) \( 3 P K \alpha \)
(3) \( \frac{P}{3 \alpha K} \)
(4) \( \frac{P}{\alpha K} \)


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