Question

400J of work is done on a gas to reduce its volume by compression adiabatically. what is the change in internal energy of the gas​

Answer 1

Answer:

-400J

Explanation:

Q=∆U+W

as, Q=0 in adiabatic process

0=∆U+W

•°•,∆U= -W

•°•,∆U= -400J

Answer 2

The change in internal energy of the gas​ will be -400 J.

Explanation:

According to the first law of thermodynamics,

$\Delta U=\Delta Q-\Delta W$

where, $\Delta U$ is the change in internal energy, $\Delta Q$  change in heat and  $\Delta W$ is the net work done on the system.

In adiabatic process, no heat supplied from outside to the system that means change in heat supplied will be zero ($\Delta Q =0$ )  .

Given $\Delta W=400J$   .

substitute the values, in above equation we get

$\Delta U=0-400J$

$\Delta U=-400J$

Thus, the change in internal energy of the gas​ will be -400 J.

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