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A sample of an ideal gas initially havin...

A sample of an ideal gas initially having internal energy `U_(1)` is allowed to expand adiabatically performing work W. Heat Q is then supplied to it, keeping the volume constant at its new value, until the pressure raised to its original value. The internal energy is then `U_(3)` (see figure). find the increase in internal energy `(U_(3) - U_(1))`?

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The correct Answer is:
`Q -W`
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