Beat frequency of two open organ pipes of lengths L and L + L1 sounded together

1. A.
   $\frac{Vl_1^2}{2l}$
2. B.
   $\frac{Vl_{1}}{2l^{2}}$
3. C.
   $\frac{Vl_{1}}{4l^{2}}$
4. D.
   $\frac{Vl^2}{2l_1}$

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1. A.
   $\frac{2vL_{1}}{L\left( L + L_{1} \right)}$
2. B.
   $\frac{2\text{ }L\left( \text{ }L + L_{1} \right)}{{vL}_{1}}$
3. C.
   $\frac{{VL}_{1}}{\text{ }L\left( \text{ }L + L_{1} \right)}$
4. D.
   $\frac{{vL}_{1}}{2\text{ }L\left( \text{ }L + L_{1} \right)}$

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1. A.
   $\dfrac{vL_1}{L(L + L_1)}$
2. B.
   $\dfrac{2vL_1}{L(L + L_1)}$
3. C.
   $\dfrac{2L(L + L_1)}{vL_1}$
4. D.
   $\dfrac{vL_1}{2L(L + L_1)}$

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