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Question

During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process on the gas will be equal to

A

1 J

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B

-1 J

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C

2 J

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D

– 2 J

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Solution

The correct option is D – 2 J
$d Q = 0 = - 2 + d W \Rightarrow d W = 2 J$
$\Rightarrow$ Work done by the gas $= 2 J$
$\Rightarrow$ Work done by the gas $= - 2 J$

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