Two pipes of lengths $L_1$ and $L_2$,open at both ends,are joined in series. If $f_1$ and $f_2$ are the fundamental frequencies of the two pipes,then the fundamental frequency of the series combination will be (neglect end correction).
- A$\frac{f_1 f_2}{f_1-f_2}$
- B$f_1+f_2$
- C$\frac{f_1 f_2}{f_1+f_2}$
- D$\sqrt{f_1^2+f_2^2}$
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