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
\(\frac{1}{2},\sqrt 2 \)
2
\(\frac{1}{4},2\sqrt 2 \)
3
\(\frac{1}{2},2\sqrt 2 \)
4
\(\frac{1}{4},\sqrt 2 \)