모두CBT
다음 중 음속(Sonic Velocity) a의 정의는? (단, g : 중력가속도, ρ : 밀도, P : 압력, s : 엔트로피이다.)
a=(dPdρ)sa = \sqrt{\left(\dfrac{dP}{d\rho}\right)_s}a=(dρdP)s
a=(dPdρ)s/ρa = \sqrt{\left(\dfrac{dP}{d\rho}\right)_s/\rho}a=(dρdP)s/ρ
a=g(dPdρ)sa = \sqrt{g\left(\dfrac{dP}{d\rho}\right)_s}a=g(dρdP)s
a=(dPdρ)s/ga = \sqrt{\left(\dfrac{dP}{d\rho}\right)_s/g}a=(dρdP)s/g