Physics - Sound Wave Question with Solution | TestHub

The distance between the open end and the closed end in the fundamental mode is $\frac{\lambda }{4}$. If the time required to cover the distance is $\mathrm{t}$, then the time required to travel distance equal to $\lambda$ will be $4\mathrm{t}$. Therefore the period of the wave is $4\mathrm{t}$. Hence the frequency is $\frac{1}{4\mathrm{t}}$.