question_answer

If \[{{l}_{1}}\]and \[{{l}_{2}}\] be the length of the air column for the first and the second resonance respectively with a tuning fork of frequency v, then the velocity of sound is given by

A)  \[v=v({{l}_{2}}-{{l}_{1}})\]          

B)  \[v=2v({{l}_{2}}-{{l}_{1}})\]

C)  \[v=\frac{2v}{{{l}_{2}}-{{l}_{1}}}\]                           

D)  \[v=\frac{v}{2({{l}_{2}}-{{l}_{1}})}\]