A well insulated box contains a partition dividing the box into two equal volumees as shown in figure. Initially, the left hand side contains an ideal monoatomic gas and the other half is a vacuum. The partition is suddenly removed so that the gas expands throughout the entire box.
(a) Does the temperature of gas change?
(b) Does the internal energy of the system change?
(c) Does the gas work?

Answer

A, B, C

Explanation

`Q=0` as the box is insulated.
`W_(gas)=0` as on the right hand side there is vacuum.
`:.` `DeltaU=Q-W=0`
`:.` `DeltaT` is also zero,
as `UpropT`