Answer
$Period$ $(T)$ $=$ $4$
Work Step by Step
$Divide$ $the$ $natural$ $period$ $of$ $a$ $sine$ $wave$ $2π$ $to$ $the$ $coefficient$ $of$ $x$ $inside$ $the$ $trigonometric$ $function$:
$Period$ $(T)$ $=$ $\frac{2\pi}{\frac{\pi}{2}}$ $=$ $\frac{2\times2\pi}{\pi}$ $=$ $4$