If two similar springs each of spring constant K1 are joined in series, the new spring constant and time period would be changed by a factor :

Question

If two similar springs each of spring constant K₁ are joined in series, the new spring constant and time period would be changed by a factor :

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

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

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

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

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