Hi all, I'm stuck on a question, and I'm hoping you guys can help... Anyway, here it is: A J-shock in a Herbig-Haro object is propagating through neutral hydrogen gas at speed 100 kms-1. The gas has number density 107 m-3 and temperature 104 K. (d) The internal energy per unit mass of a gas is, U= ((gamma) - 1)^-1 * P/(rho). Use this to show that the specific internal energy of the post shock gas is, 3/2 * P(1)/(rho)(1)= 9/32 v(0)^2. In this question; (gamma) = the adiabatic constant, which, for H(2) is 7/5 P(1) = Post shock pressure = 5/6 (rho)(0) v(0)^2 (rho)(1) = 6(rho)(0) which I believe is all that should be required, symbol-wise. I can do this for a monatomic gas, but I'm having trouble getting the same result for a diatomic gas. Have I made a mistake in assuming that the shock is propagating through a diatomic gas?