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-it`
C. `-(pi)/(2) atm-it`
D. `4atm-it`

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-it.