Q. A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the thermal energy
A) $3/5$
B) $3/7$
C) $5/7$
D) $5/9$
Explanation
(c) $\because C_{P} - C_{v} = R$
Fractional part of heat energy $= \frac{C_{P} - R}{C_{P}}$
$= \frac{\frac{7}{2}R - R}{\frac{7}{2}R} = \frac{5}{7}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.