Question

The coefficient of superficial expansion of a solid is 2 × 10^–5 /°C. It's coefficient of linear expansion is

• A. 4 × 10^–5/°C
• B. 3 × 10^–5/°C
• C. 2 × 10^–5/°C
• D. 1 × 10^–5/°C

Answer 1

Answer: (D)

1 × 10^–5/°C

Answer 2

$\alpha = \frac{\beta}{2} = \frac{2 \times 10^{- 5}}{2} = 10^{- 5}/{^\circ}C$