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 [MP PMT 1989; MP PET 1992]

• A.    \[{{C}_{v}}/{{C}_{p}}\]         
• B.    \[{{C}_{p}}/{{C}_{v}}\]     
• C.           \[{{C}_{p}}{{C}_{v}}\]          
• D.    \[1/{{C}_{p}}{{C}_{v}}\]