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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 ${E}_{\varnothing }$ and${E}_{\theta }$  respectively. The  ratio of ${E}_{\varnothing }$ to ${E}_{\theta }$ is

(a) ${C}_{v}/{C}_{p}$

(b) ${C}_{p}/{C}_{v}$

(c) ${C}_{p}{C}_{v}$

(d) $1/{C}_{p}{C}_{v}$