抛物线\(M\)：\(y^{2}=4x\)的准线与\(x\)轴交于点\(A\)，点\(F\)为焦点，若抛物线\(M\)上一点\(P\)满足\(PA⊥PF\)，则以\(F\)为圆心且过点\(P\)的圆被\(y\)轴所截得的弦长约为\((\)参考数据：\( \sqrt {5}≈2.24)(\)　　\()\)