Answer : The correct option is (A).
Explanation :
The relation between speed of sound and the density of medium is given by :
[tex]v=\sqrt{\dfrac{B}{\rho}}[/tex]
where
B is the bulk modulus
and [tex]\rho[/tex] is the density of the medium.
So, it is clear that the speed of sound is inversely proportional to the density of medium i.e.
[tex]v\propto\dfrac{1}{\sqrt{\rho} }[/tex]
The correct graph (A). From the graph it is clear that when density of medium approaches to zero, the speed of sound tends to infinite and vice versa.
