Question

If the volume of a block of a metal changes by 0.12% when it is heated through 20°C, what is the coefficient of linear expansion of metal?

(1) 2.0 × 10^–3 Per °C

(2) 2.0 × 10^–5 Per °C

(3) 2.0 × 10^–7 Per °C

(4) 2.0 × 10^–2 Per °C

Answer 1

Correct Answer is: (2) 2.0 × 10^–5 Per °C

Coefficient of cubical expansion of metal is given by

Coefficient of linear expansion