Question

The coefficient of linear expansion of a solid depends on?

• A. Unit of length
  
• B. Scale of temperature
  
• C. Density of the material
  
• D. None of the above

Answer 1

The correct option is B

Scale of temperature

The coefficient of linear expansion is the increase in length of an object per unit length per degree rise in temperature.

$\alpha =\frac{l_2-l_1}{l_1(t_2-t_1)}$
$\alpha$ depends on the scale of temperature, it does not depends on the length as it depends on the ratio of length.