The specific heat at constant pressure and at constant volume for an ideal gas are ${C_p}$ and ${C_v}$ and its adiabatic and isothermal elasticities are ${E_\varphi }$ and ${E_\theta }$ respectively. The ratio of ${E_\varphi }$ to ${E_\theta }$ is
  • A${C_v}/{C_p}$
  • B${C_p}/{C_v}$
  • C${C_p}{C_v}$
  • D$1/{C_p}{C_v}$
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