In a resonance column lab experiment to measure the velocity of sound,the first resonance is obtained at a length $l_1$ and the second resonance at a length $l_2$. Then-
- A$l_2 > 3l_1$
- B$l_2 = 3l_1$
- C$l_2 < 3l_1$
- Dmay be any of the above,depending on the frequency of the tuning fork used.
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