In the `P-V` diagram shown shown in figure `ABC` is a semicircle.The work done in the process `ABC` is

Options

A. `zero`
B. `(pi)/(2) atm-L`
C. `-(pi)/(2) atm-L`
D. `4 atm-L`.

Answer

B

Explanation

`W_(AB)` is negative (volume is decreasing)and `W_(BC)` is positive (volume is increasing) and since,
`|W_(BC)|gt|W_(AB)|`
`:.` Net work done is positive and area between semicircle which is equal to `(pi)/(2)"atm"-L`.