The frequency of oscillations of a mass $m$ connected horizontally by a spring of spring constant $k$ is $4 Hz$. When the spring is replaced by two identical spring as shown in figure. Then the effective frequency is,
  • A$4 \sqrt{2}$
  • B$1.5$
  • C$1.31$
  • D$2 \sqrt{2}$
AIIMS 2016, Medium
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