Published by:
CGP EDU Academic Team
Published on: September 11, 2026
When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is
$(a) \frac{2}{5} (b) \frac{3}{5} (c) \frac{3}{7} (d) \frac{5}{7}$
Text Solution
Verified by ExpertsThe correct answer is:
D
Fraction of supplied energy which increases the internal energy is given by
$f = \frac{\Delta U}{(\Delta Q)_{P}} = \frac{(\Delta Q)_{V}}{(\Delta Q)_{P}} = \frac{\mu C_{V} \Delta T}{\mu C_{P} \Delta T} = \frac{1}{\gamma}$ For diatomic gas $\gamma = \frac{7}{5} \implies f = \frac{5}{7}$
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