Question 13 An adiabatic free expansion of a gas in a thermally isolated contain

Question

Question 13

An adiabatic free expansion of a gas in a thermally isolated container is not reversible because

work must be done on the gas to return it to its original volume.

heat must be exchanged with the surroundings to return the gas to its original temperature.

its internal energy has a greater value after the expanded gas is returned to its original volume and temperature.

of all of the above.

of (a) and (b) above only.

work must be done on the gas to return it to its original volume.

heat must be exchanged with the surroundings to return the gas to its original temperature.

its internal energy has a greater value after the expanded gas is returned to its original volume and temperature.

of all of the above.

of (a) and (b) above only.

Explanation / Answer

all the above is correct

when ever there is free expansion then work done by the gas using its internal energy so it looses heat so the temperature will fall down.

to return to its original position work has to be done on the gas and it should be exchange the heat with the surrounding then it can reback to original state.

before expansion the gas is with greater internal energy where as after expansion internal energy is reduced.

so all the above is correct

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