The fundamental frequency of a sonometer wire of length $l$ is $n_0$ . A bridge is now introduced at a distance of $\Delta l ( < < l)$ from the centre of the wire. The lengths of wire on the two sides of the bridge are now vibrated in their fundamental modes. Then, the beat frequency nearly is
  • A$n_0\ \Delta l/l$
  • B$8\ n_0\ \Delta l/l$
  • C$2\ n_0\ \Delta l/l$
  • D$n_0\ \Delta l/2l$
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