3000 J of heat is given to a gas at constant pressure of 2×105 N/m2 If its volume increases by 10 litres during the process find the change in the internal energy of the gas.
A
−1000 J
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B
1000 J
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C
−2000 J
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D
2000 J
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Solution
The correct option is B1000 J Heat given to the system △Q=3000J pressure applied = 2×105N/m2) W=P△V=(2×105N/m2)(10×10−3m3) =2×103J from first law of thermodynamic, △U=△Q−W=3000−2000=1000J.