WAEC Physics 2022 Paper

Concept:For a solid, the cubic expansivity is approximately three times the linear expansivity.Explanation:Linear expansivity $\alpha$ measures the fractional change in length per degree change in temperature. Cubic expansivity $\gamma$ measures the fractional change in volume per degree change in temperature. For an isotropic solid, the volume expansion is three times the expansion in one dimension. Therefore, the relation is: $$\gamma = 3\alpha$$ This matches option B.Answer:$$\gamma = 3\alpha$$ Option B.