Question 11 Mark
A Kundt's tube apparatus has a copper rod of length 1.0m clamped at 25cm from one of the ends. The tube contains air in which the speed of sound is 340m/s. The powder collects in heaps separated by a distance of 5.0cm. Find the speed of sound waves in copper.
Answer
View full question & answer→$\text{V}_\text{rod}=?,\ \text{V}_\text{air}=340\text{m/s},$
$\text{L}_\text{r}=25\times10^{-2},\ \text{d}_2=5\times10^{-2}\ \text{meters}$
$\frac{\text{V}_\text{r}}{\text{V}_\text{a}}=\frac{2\text{L}_\text{r}}{\text{D}_\text{a}}$
$\Rightarrow\text{V}_\text{r}=\frac{340\times25\times10^{-2}\times 2}{5\times10^{2}}$
$\Rightarrow \text{V}_{\text{rod}}=3400\text{m/s}$