What happens when a solid is heated, it:

expands proportionally to the change in temperature.

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contracts proportionally to the change in temperature.

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expands inversely proportional to the change in temperature.

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contracts inversely proportional to the change in temperature.

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does not expand or contract

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Solution

The correct option is A expands proportionally to the change in temperature.
A solid experiences a photographic expansion upon heating, that is, the dimensions of the solid expand uniformly in all directions, including the holes present in the solid. Quantitatively, the volume of the solid on heating is given by
$V = V_{0} (1 + γ Δ T)$

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