Reversible adiabatic process may be expressed as (T1/T2) equal to

• A. \({\left( {\frac{{{v_2}}}{{{v_1}}}} \right)^{\gamma + 1}}\)
• B. \({\left( {\frac{{{v_2}}}{{{v_1}}}} \right)^{\frac{{\gamma - 1}}{\gamma }}}\)
• C. \({\left( {\frac{{{p_1}}}{{{p_2}}}} \right)^{\frac{{\gamma - 1}}{\gamma }}}\)
• D. \({\left( {\frac{{{p_1}}}{{{p_2}}}} \right)^{\gamma - 1}}\)