Question

Density of substance at 0°C is g/cc and 100°C, its density is 9.7g/cc. The coefficient of linear expansion of the substance is?

(a) 10^-1

(b) 10^-2

(c) 10^-3

(d) 10^-4

This question was addressed to me in an international level competition.

This interesting question is from Absorption and Emission topic in chapter Kinetic Theory of Gases of Engineering Physics I

Answer 1

The correct option is (d) 10^-4

To explain: γ=(ρ0-ρt)/(ρ0×t)=(10-9.7)/(10×100)=3×10^-4

α=γ/3=10^-4°C^-1.