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Q.

When an ideal diatomic gas is heated at constant pressure, its internal energy increased by 50 cal, then the work done by the gas is ...................... cal.

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answer is 20.

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Detailed Solution

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$\frac{dU}{W} = \frac{1}{^{γ - 1}} \Rightarrow \frac{50}{W} = \frac{5}{2} \Rightarrow W = 20 cal$

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