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28/09/2021 8:57 pm
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A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A:
(a) 10 J of the work will be done by the gas.
(b) 6 J of the work will be done by the gas.
(c) 10 J of the work will be done by the surrounding on gas.
(d) 6 J of the work will be done by the surrounding on gas.
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28/09/2021 9:05 pm
Correct answer: (d) 6 J of the work will be done by the surrounding on gas.
Explanation:
A \(\overset{q = +5,\; W = 8J}\longrightarrow\)B
ΔUAB = q + w
= 5 + (-8) = -3
q = -3, ΔUAB = +3
ΔUAB = q + w
⇒ 3 = -3 + w
⇒ w = +6 J (Work done on the system).