The fundamental frequency of a sonometre wire is $n.$ If its radius is doubled and its tension becomes half, the material of the wire remains same, the new fundamental frequency will be
  • A$n$
  • B$\frac{n}{{\sqrt 2 }}$
  • C$\frac{n}{2}$
  • D$\frac{n}{{2\sqrt 2 }}$
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