Fundamental frequency of one closed pipe is $300$ $\mathrm{Hz}$. What will be the frequency of its second overtone ?

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Frequency of second overtone $=$ frequency of third harmonic $=(2 n-1) f_{1} \quad($ here $n=3)$ $=5 f_{1}=5 \times 300=1500 \mathrm{~Hz}$

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