Question

In variable state, the rate of flow of heat is controlled by

• A. Density of material
• B. Specific heat
• C. Thermal conductivity
• D. All the above factors

Answer 1

Answer: (D)

All the above factors

Answer 2

In variable state $\frac{Q}{t} \propto K$ and $\frac{Q}{t} \propto \frac{1}{\rho c}$⇒ $\frac{Q}{t} \propto \frac{K}{\rho c}$

(K = thermal conductivity, ρ = density, c = specific heat)