At what temperature is the velocity of sound double that of its velocity at $0^{\circ}C$?

Which of the following is not a transverse wave?

$v_1$ and $v_2$ are the velocities of sound at the same temperature in two monoatomic gases of densities $\rho_1$ and $\rho_2$ respectively. If $\frac{\rho_1}{\rho_2} = \frac{1}{4}$,then the ratio of velocities $v_1$ and $v_2$ will be

What is the ratio of the velocity of sound in hydrogen $\left(\gamma=\frac{7}{5}\right)$ to that in helium $\left(\gamma=\frac{5}{3}\right)$ at the same temperature? (Molecular weight of hydrogen and helium is $2$ and $4$ respectively)

What will be the shape of the graph of the speed of sound in air versus pressure at a constant temperature?

Ultrasonic,infrasonic,and audible waves travel through a medium with speeds $V_u$,$V_i$,and $V_a$ respectively. Then: