Question

The ratio of work done by an ideal diatomic gas to the heat supplied by the gas in an isobaric process is –

• A. $\frac{5}{7}$
• B. $\frac{3}{5}$
• C. $\frac{2}{7}$
• D. $\frac{5}{3}$

Answer 1

Answer: (C)

$\frac{2}{7}$

Answer 2

$\frac{\Delta W}{(\Delta Q)_{P}} = \frac{(\Delta Q)_{P} - (\Delta U)_{P}}{(\Delta Q)_{P}} = 1 - \frac{(\Delta U)_{P}}{(\Delta Q)_{P}}$

= 1 – $\frac{\frac{5}{2}R}{\frac{7}{2}R}$= 1 – $\frac{5}{7} = \frac{2}{7}$