Which harmonics are these ?

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Solution

The correct option is B 8
For $n^{t h}$ harmonic for string taut at two ends, $l = \frac{n λ}{2}$
Thus $λ \propto \frac{1}{n}$
Thus $\frac{n + 1}{n} = \frac{0.54}{0.48}$
$⟹ n = 8$

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