A 1 kg block attached to a spring vibrates with a frequency of 1 Hz on a frictionless horizontal table. Two springs identical to the original spring are attached in parallel to an 8 kg block placed on the same table. So, the frequency of vibration of the 8 kg block is :

Question

$\begin{array}{1 1}(1)\; \frac{1}{4}Hz \\ (2)\; \frac{1}{2 \sqrt 2} Hz \\ (3)\; \frac{1}{2} Hz \\ (4)\; 2 Hz \end{array} $