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).
-
A.
1.503m2 -
B.
1.500m2 -
C.
1.498m2 -
D.
1.497m2 -
E.
1.490m2
Correct Answer: Option C
Explanation
(beta) = A2 – A1
2 X 10-5 x 2.5 = (frac{A_2 times 1.5}{1.5 times (-20 -20)})
A2 = 1.498m2