$A$ tuning fork of frequency $n$ is held near the open end of a tube which is closed at the other end,and the length is adjusted until resonance occurs. The first resonance occurs at length $L_1$ and the immediate next resonance occurs at length $L_2$. The speed of sound in air is
- A$n(L_2 - L_1)$
- B$\frac{n(L_2 - L_1)}{2}$
- C$2n(L_2 - L_1)$
- D$\frac{n(L_2 + L_1)}{2}$
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