4{{l}_{1}}}\] and \[{{n}_{2}}=\frac{v}{4{{l}_{2}}}\] Þ \[\frac{{{n}_{1}}}{{{n}_{2}}}=\frac{{{l}_{2}}}{{{l}_{1}}}=\frac{26}{25}\] ?..(ii) After solving these equation \[{{n}_{1}}=260Hz\],\[{{n}_{2}}=250\]\[Hz\]