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The ratio of two specific heats of gas Cp/Cv for argon is 1.6 and for hydrogen is 1.4. Adiabatic elasticity of argon at pressure P is E. Adiabatic elasticity of hydrogen will also be equal to E at the pressure

(a) P                                        (b) 87P

(c) 78P                                    (d) 1.4P