Topic: Heat Transfer
When K is the thermal conductivity, tau is the density and Cp is the specific heat of a substance, then thermal diffusivity is given by
- A. K / (tau*Cp)
- B. (K*Cp) / tau
- C. (tau*Cp) / K
- D. (K*tau) / Cp
Answer: A. K / (tau*Cp)
Explanation: Thermal diffusivity alpha = k / (rho * Cp). Given that density rho = tau, the expression becomes alpha = K / (tau * Cp).