(1) Speed of transverse wave motion :

(i) On a stretched string :     T = Tension in the string;  m = Linear density of string (mass per unit length).

(ii) In a solid body : = Modulus of rigidity;  = Density of the material.

(2) Speed of longitudinal wave motion :

(i) In a solid medium

k = Bulk modulus;   = Modulus of rigidity;  = Density

When the solid is in the form of long bar  Y = Young's modulus of material of rod

(ii) In a liquid medium

(iii) In gases