$A$ weightless spring which has a force constant $k$ oscillates with frequency $n$ when a mass $m$ is suspended from it. The spring is cut into two equal halves and a mass $2m$ is suspended from one of the halves. The frequency of oscillation will now become:
- A$n$
- B$2n$
- C$\frac{n}{\sqrt{2}}$
- D$n\sqrt{2}$
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