Open pipe of length l and internal radius r: fundamental frequency with end correction

1. A.
   $\frac{V}{2(l+1.2r)}$
2. B.
   $\frac{V}{(l+1.2r)}$
3. C.
   $\frac{V}{(l+0.3r)}$
4. D.
   $\frac{V}{(l+0.6r)}$

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1. A.
   $\dfrac{V}{(l+0.3r)}$
2. B.
   $\dfrac{V}{(l+1.2r)}$
3. C.
   $\dfrac{V}{(l+0.6r)}$
4. D.
   $\dfrac{V}{2(l+1.2r)}$

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