Question

When an ideal diatomic gas is heated at constant pressure than the ratio of heat energy given to the change in internal energy of the gas is

• A. 7/5
• B. 5/7
• C. 3/5
• D. 5/3

Answer 1

Answer: (A)

7/5

Answer 2

∆U = nC_v∆T, ∆Q = nC_P∆T

$\frac{\Delta Q}{\Delta U} = \frac{nC_{p}\Delta T}{nC_{v}\Delta T}$ = γ = 7/5 [for diatomic gas γ = 7/5]