The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is:
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Question

The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is:

G1 Physics · Accepted Answer

Step 1: Given Cₚ = (7/2)R. Step 2: Mayer’s relation Cₚ − Cᵥ = R implies Cᵥ = (7/2)R − R = (5/2)R. Step 3: γ = Cₚ/Cᵥ = (7/2)/(5/2) = 7/5. Final answer: (B).