Question

QUESTION 7** On a 1 m square plate is a hole of area A 0.3 m2 at T: 200 K The plate is made of a material whose linear thermal expansion coefficient is α increase AA of the area of the window at T-300 K compared with that at T- 200 K? 13 x 10 6 K l what is the ΔΑ: 5.3x10-4m2 ΔΑ = 7.8 × 10-4 m2 ΔΑ = 9.3 × 10-4 m2 ΔΑ =11.2×10-4 m2 4A = 3.5 x 10-4 m2 (a) O(b) (c) 0(d) O (e) 0.3 m2 1 mi

Answer 1

Linear expansion of area is given by:

here,

13 * 106K-i

  

ΔΑ 2 × 13 × 10°(T-T) ДА 2 × 13 × 10°(300-200) = 2.6 × 10-3 ▲A = A × 2.6 × 10-3m? ▲A = 7.8 × 10-4m2

So, `option b is correct.

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