A thin aluminum plate has a surface area of 1500m at 20^oC. What will be its surface area when it is cooled to -20^oC? (Take the linear expansivity of aluminum to be 2.5 x 10^-5k^-1).

1.503m²

1.500m²

1.498m²

1.497m²

1.490m²

Correct answer is C

\(\beta\) = A₂ - A₁

2 X 10^-5 x 2.5 = \(\frac{A_2 \times 1.5}{1.5 \times (-20 -20)}\)

A₂ = 1.498m²

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A thin aluminum plate has a surface area of 1500m at 20oC. What will be its surface area when it is cooled to -20oC? (Take the linear expansivity of aluminum to be 2.5 x 10-5k-1).