$4.0~\text{gm}$ of gas occupies $22.4~\text{litres}$ at NTP. The specific heat capacity of the gas at a constant volume is  $5.0~\text{JK}^{-1}\text{mol}^{-1}.$ If the speed of sound in the gas at NTP is $952~\text{ms}^{-1},$ then the molar heat capacity at constant pressure will be:
($R=8.31~\text{JK}^{-1}\text{mol}^{-1}$) 

Two strings $A$ and $B,$ made of the same material, are stretched by the same tension. The radius of string $A$ is double of the radius of $B.$ A transverse wave that travels on $A$ with a speed $v_A$ and on $B$ with a speed $v_B.$ The ratio of  $\frac{v_A}{v_B}$ is:

The speed of sound in air at standard temperature and pressure is:
(Given the mass of $1$ mole of air is $29.0\times10^{-3}~\text{kg}$ and $\gamma=7/5 \text)$
1. $240 ~\text{m/s}$ 
2. $331.5~\text{m/s}$ 
3. $384.5~\text{m/s}$ 
4. $280~\text{m/s}$ 

The speed of sound in a medium depends on: