NEET Physics Thermodynamics Questions Solved

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 -

(1) $\frac{2}{5}$

(2) $\frac{3}{5}$

(3) $\frac{3}{7}$

(4) $\frac{5}{7}$

(4) Fraction of supplied energy which increases the internal energy is given by

$f=\frac{\Delta U}{{\left(\Delta Q\right)}_{P}}=\frac{{\left(\Delta Q\right)}_{V}}{{\left(\Delta Q\right)}_{P}}=\frac{\mu {C}_{V}\Delta T}{\mu {C}_{P}\Delta T}=\frac{1}{\gamma }$

For diatomic gas $\gamma =\frac{7}{5}$$f=\frac{5}{7}$

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