A rectangular piece of iron measuring 4 cm by 3 cm at 20${}^o$C is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10${}^{-5}$ K${}^{-1}$]

A. 12.0144 cm${}^3$
B. 12.0346 cm${}^3$
C. 12.0288 cm${}^3$  
D. 12.0173 cm${}^3$

Show Answer Show Explanation

Correct Answer: C