A tuning fork has frequency of vibration $200 \mathrm{Hz}$. If velocity of sound in air is $330 \mathrm{m} {\mathrm{s}}^{-1}$, then how far the sound has traversed while tuning fork completes $20$ vibrations?

$y$ versus $x$ graph of a transverse wave propagating through the medium is shown, where $y$ is displacement of particles from their mean position at distance $x$ from the source at $t=0 .$ Select the incorrect statement about particles shown in figure

The displacement $\left(y\right)$ and time $\left(t\right)$ graph for two sound waves is shown in figure. The ratio of their intensities is

Both the strings, shown in the figure, are made of the same material and have the same cross-section. The pulleys are light. The wave speed of a transverse wave in the string $AB$ is $v_1$ and in $CD$ it is $v_2.$ Then $\frac{v_1}{v_2}$ is