# NEET Physics Thermodynamics Questions Solved

If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is

(1) $R/\left(\gamma -1\right)$

(2) pV

(3) $pV/\left(\gamma -1\right)$

(4) $\gamma pV/\left(\gamma -1\right)$

(3) $\Delta U=\mu {C}_{V}\Delta T=n\left(\frac{R}{\gamma -1}\right)\Delta T$

$⇒\Delta U=\frac{P\Delta V}{\left(\gamma -1\right)}=\frac{P\left(2V-V\right)}{\gamma -1}=\frac{PV}{\left(\gamma -1\right)}$

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