A) 2 J
B) 4 J
C) zero
D) infinity
Correct Answer: C
Solution :
External pressure \[\text{(}{{\text{p}}_{\text{Ext}}}\text{)}\,\text{=}\,\text{0}\] (for vacuum) In other words, the gas expands against a zero external pressure. Hence, no work is done, because there is no force which oppose expansion. \[W={{p}_{ext}}\Delta V=0\]
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