Difficult
$A$ tuning fork of frequency '$n$' is held near the open end of a tube which is dipped in water and length of the tube is adjusted until resonance occurs. If the two shortest lengths that produce resonance are $l_1$ and $l_2$, the speed of sound in air is (neglect end correction)
- A$2n(l_2 - l_1)$
- B$n(l_2 - l_1)$
- C$\frac{n}{2}(l_2 - l_1)$
- D$\frac{2n}{(l_2 - l_1)}$
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