In the Kundts tube experiment (shown in fig. $(i)$), the rod is clamped at the end instead of clamping it at the center as shown in fig. $(ii).$ It is known that speed of sound in air is $330\ m/s$, powder piles up at successive distance of $0.6\ m$ and length of rod used is $1\ m$, speed of sound in rod is .... $\frac{m}{s}$
Diffcult
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ln rod, $\frac{\lambda }{4} = l \Rightarrow \lambda = 4l \Rightarrow {v_r} = \lambda v = 4lv$
In air column ${{\rm{v}}_{\rm{a}}} = 2\Delta l{\rm{v}}$
$\frac{{{v_r}}}{{{v_a}}} = \frac{{2l}}{{\Delta l}} \Rightarrow {v_r} = \frac{{2 \times 1 \times 330}}{{0.6}} = 1100\,{\rm{m}}/{\rm{s}}$
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