The graph that best represents the speed of sound relative to the density of the medium it is traveling through is
a)
b)
c)
d)

Answer : The correct option is (A).

Explanation :

The relation between speed of sound and the density of medium is given by :

where

B is the bulk modulus

and 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.

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.