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Consider a rectangular sheet of solid material of length  = 9 cm and width d = 4 cm. The coefficient of linear expansion is  = 3.1 × 10 – 5 K – 1 at room temperature and one atmospheric pressu re. The mass of sheet m = 0.1 kg and the specific heat capacity C v = 900 J kg – 1 K – 1 . If the amount of heat supplied to the material is 8.1 ×10 2 J then change in area of the rectangular sheet is

1. 4.0 × 10 – 7 m 2
2. 2.0 × 10 – 6 m 2
3. 6.0 × 10 – 7 m 2
4. 3.0 × 10 – 7 m 2

Correct answer: 2.0 × 10 – 6 m 2

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