Question

A Kundt's tube apparatus has a copper rod of length 1.0 m clamped at 25 cm from one of the ends. The tube contains air in which the speed of sound is 340 in/s. The powder collects in heaps separated by a distance of 5.0 cm. Find the speed of sound waves in copper.

Answer 1

$V_{rod}=?,V_{air}=340m/s,$

$L_1=25\times {10}^{-2},$

$d_3=5\times {10}^{-2}meters$

$\frac{V_{rod}}{V_{air}}=\frac{2L_1}{d_3}$

$\Rightarrow V_1=\frac{340\times 25\times {10}^{-2}\times 2}{5\times {10}^{-2}}$

=340 m/s