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If \( f_{1}, f_{2} \) and \( f_{3} \) are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency \( f_{0} \) of the whole string is
(a) \( f_{0}=f_{1}+f_{2}+f_{3} \)
(b) \( \frac{1}{f_{0}}=\frac{1}{f_{1}}+\frac{1}{f_{2}}+\frac{1}{f_{3}} \)
\( \mathrm{P} \)
(c) \( \frac{1}{\sqrt{f_{0}}}=\frac{1}{\sqrt{f_{1}}}+\frac{1}{\sqrt{f_{2}}}+\frac{1}{\sqrt{f_{3}}} \)
(d) None of these
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