What will be the work done on an ideal gas enclosed in a cylinder, when it is compressed by a co...

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What will be the work done on an ideal gas enclosed in a cylinder, when it is compressed by a constant external pressure, \( p_{\text {ext }} \) in a single step as shown in figure?
(a) Work done \( =-p_{\text {ext }}\left(V_{f}-V_{i}\right) \)
(b) Work done \( =-p_{\text {ext }}\left(V_{i}-V_{f}\right) \)
(c) Work done \( =+p_{\text {ext }}\left(V_{f}-V_{i}\right) \)
(d) Work done \( =-p\left(V_{f}-V_{i}\right) \)
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