If two similar springs each of spring constant $K _{1}$ are joined in series, the new spring constant and time period would be changed by a factor

  • [JEE MAIN 2021]
  • A

    $\frac{1}{2}, \sqrt{2}$

  • B

    $\frac{1}{4}, \sqrt{2}$

  • C

    $\frac{1}{4}, 2 \sqrt{2}$

  • D

    $\frac{1}{2}, 2 \sqrt{2}$

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  • [JEE MAIN 2017]

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