Directions: Question are based on the following paragraph.

Two moles of helium gas are taken over the cycle ABCDA, as shown in the P-T diagram.

Question: Assuming the gas to be ideal the work done on the gas in taking it from A\; to\; B is

  • Option 1)

    200R

  • Option 2)

    300R

  • Option 3)

    400R

  • Option 4)

    500R

 

Answers (1)

As we learnt in

Reversible Isobaric Process -

W=P\left ( V_{f}-V_{i} \right )
 

- wherein

P_{gas}= constant

Since pressure of gas is defined during whole of the process and hence the process must be reversible

 

 WAB = P.\DeltaV= n R\DeltaT = 2 \times (500-300) R = 400 R 

 


Option 1)

200R

This option is incorrect.

Option 2)

300R

This option is incorrect.

Option 3)

400R

This option is correct.

Option 4)

500R

This option is incorrect.

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