Question

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

• A. $1J$
• B. $-1J$
• C. $2J$
• D. $-2J$

Answer 1

Answer: (C)

$2J$

For adiabatic process, q=0

w = $\Delta U$

Hence, Work done on the gas is $2$ joule.

So, work done on the gas $=+2$ joule.

Hence, option C is correct