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

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

A. 12.0144 cm³
B. 12.0346 cm³
C. 12.0288 cm³
D. 12.0173 cm³

Correct Answer:

Option C = 12.0288 cm³