The P-V diagram of 2 gm of helium gas for a certain process A → B is shown in the figure. what is the heat given to the gas during the process A → B
A
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B
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C
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D
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Solution
The correct option is B Change in internal energy from A→B △U=f2μR△T=f2(PfVf−PiVi) =32(2P0×2V0−P0×V0)=92P0V0 work done in process A→B is equal to the area covered by the graph with volume axis i.e., WA→B=12(P0+2P0)×(2V0−V−0)=32P0V0 Hence,△Q=△U+△W=92P0V0+32P0V0=6P+0V0