The frequency of oscillation of a mass $m$ suspended by a spring is $v_1$. If length of spring is cut to one third then the same mass oscillates with frequency $v_2$, then
  • A$v_2=3 v_1$
  • B$3 v_2=v_1$
  • C$v_2=\sqrt{3} v_1$
  • D$\sqrt{3} v_2=v_1$
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