Answer
.61 times the original volume.
Work Step by Step
We use the known equation to find:
$(\frac{V_2}{V_1})^{\gamma}=\frac{p_1}{p_2}$
$(\frac{V_2}{V_1})^{1.4}=.5$
$(\frac{V_2}{V_1})^{1.4}=.61$
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