The tension in a piano wire is $10N$. What should be the tension in the wire to produce a note of double the frequency .... $N$
AIIMS 2001, Medium
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(c) $n \propto \sqrt T $
==> $\frac{{{n_1}}}{{{n_2}}} = \sqrt {\frac{{{T_1}}}{{{T_2}}}} $
==> $\frac{n}{{2n}} = \sqrt {\frac{{10}}{{{T_2}}}} $
==> ${T_2} = 40N$
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