Question

For a compressible fluid, sonic velocity is                                                                                                     

  (a) a property of the fluid

   (b) always given by ($\gamma$RT)^1/2 where $\gamma$, R and T are respectively the ratio of specific heats, gas constant and           temperature in K

    (c) always given by $\left ( \frac{\partial \rho }{\partial \rho } \right )^{\frac{1}{2}}_{s}$. Where p, r and s are respectively pressure, density and entropy

    (d) always greater than the velocity of fluid At any location