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  4. The heat change at constant volume (QV) is equal to

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Q. The heat change at constant volume $ (Q_{V}) $ is equal to

Uttarkhand PMTUttarkhand PMT 2009

Solution:

From first law of thermodynamics,
$\Delta E=Q+W$ or $\Delta E=Q+p \Delta W$
At constant volume, $\Delta V=0$
$\therefore p \Delta V=0$ or $ \Delta E=Q_{V}$